January 2025 - Linux-stable-mirror

[merged mm-hotfixes-stable] tools-fix-atomic_set-definition-to-set-the-value-correctly.patch removed from -mm tree

by Andrew Morton

The quilt patch titled Subject: tools: fix atomic_set() definition to set the value correctly has been removed from the -mm tree. Its filename was tools-fix-atomic_set-definition-to-set-the-value-correctly.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Suren Baghdasaryan <surenb(a)google.com> Subject: tools: fix atomic_set() definition to set the value correctly Date: Fri, 27 Dec 2024 14:22:20 -0800 Currently vma test is failing because of the new vma_assert_attached() assertion. The check is failing because previous refcount_set() inside vma_mark_attached() is a NoOp. Fix the definition of atomic_set() to correctly set the value of the atomic. Link: https://lkml.kernel.org/r/20241227222220.1726384-1-surenb@google.com Fixes: 9325b8b5a1cb ("tools: add skeleton code for userland testing of VMA logic") Signed-off-by: Suren Baghdasaryan <surenb(a)google.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Jann Horn <jannh(a)google.com> Cc: Liam R. Howlett <Liam.Howlett(a)Oracle.com> Cc: Vlastimil Babka <vbabka(a)suse.cz> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- tools/testing/shared/linux/maple_tree.h | 2 +- tools/testing/vma/linux/atomic.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/tools/testing/shared/linux/maple_tree.h~tools-fix-atomic_set-definition-to-set-the-value-correctly +++ a/tools/testing/shared/linux/maple_tree.h @@ -2,6 +2,6 @@ #define atomic_t int32_t #define atomic_inc(x) uatomic_inc(x) #define atomic_read(x) uatomic_read(x) -#define atomic_set(x, y) do {} while (0) +#define atomic_set(x, y) uatomic_set(x, y) #define U8_MAX UCHAR_MAX #include "../../../../include/linux/maple_tree.h" --- a/tools/testing/vma/linux/atomic.h~tools-fix-atomic_set-definition-to-set-the-value-correctly +++ a/tools/testing/vma/linux/atomic.h @@ -6,7 +6,7 @@ #define atomic_t int32_t #define atomic_inc(x) uatomic_inc(x) #define atomic_read(x) uatomic_read(x) -#define atomic_set(x, y) do {} while (0) +#define atomic_set(x, y) uatomic_set(x, y) #define U8_MAX UCHAR_MAX #endif /* _LINUX_ATOMIC_H */ _ Patches currently in -mm which might be from surenb(a)google.com are alloc_tag-skip-pgalloc_tag_swap-if-profiling-is-disabled.patch seqlock-add-raw_seqcount_try_begin.patch mm-convert-mm_lock_seq-to-a-proper-seqcount.patch mm-introduce-mmap_lock_speculate_try_beginretry.patch mm-introduce-vma_start_read_locked_nested-helpers.patch mm-move-per-vma-lock-into-vm_area_struct.patch mm-mark-vma-as-detached-until-its-added-into-vma-tree.patch mm-introduce-vma_iter_store_attached-to-use-with-attached-vmas.patch mm-mark-vmas-detached-upon-exit.patch types-move-struct-rcuwait-into-typesh.patch mm-allow-vma_start_read_locked-vma_start_read_locked_nested-to-fail.patch mm-move-mmap_init_lock-out-of-the-header-file.patch mm-uninline-the-main-body-of-vma_start_write.patch refcount-introduce-__refcount_addinc_not_zero_limited.patch mm-replace-vm_lock-and-detached-flag-with-a-reference-count.patch mm-move-lesser-used-vma_area_struct-members-into-the-last-cacheline.patch mm-debug-print-vm_refcnt-state-when-dumping-the-vma.patch mm-remove-extra-vma_numab_state_init-call.patch mm-prepare-lock_vma_under_rcu-for-vma-reuse-possibility.patch mm-make-vma-cache-slab_typesafe_by_rcu.patch docs-mm-document-latest-changes-to-vm_lock.patch alloc_tag-avoid-current-alloc_tag-manipulations-when-profiling-is-disabled.patch

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[merged mm-hotfixes-stable] mm-kmemleak-fix-percpu-memory-leak-detection-failure.patch removed from -mm tree

by Andrew Morton

The quilt patch titled Subject: mm/kmemleak: fix percpu memory leak detection failure has been removed from the -mm tree. Its filename was mm-kmemleak-fix-percpu-memory-leak-detection-failure.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Guo Weikang <guoweikang.kernel(a)gmail.com> Subject: mm/kmemleak: fix percpu memory leak detection failure Date: Fri, 27 Dec 2024 17:23:10 +0800 kmemleak_alloc_percpu gives an incorrect min_count parameter, causing percpu memory to be considered a gray object. Link: https://lkml.kernel.org/r/20241227092311.3572500-1-guoweikang.kernel@gmail.… Fixes: 8c8685928910 ("mm/kmemleak: use IS_ERR_PCPU() for pointer in the percpu address space") Signed-off-by: Guo Weikang <guoweikang.kernel(a)gmail.com> Acked-by: Uros Bizjak <ubizjak(a)gmail.com> Acked-by: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Guo Weikang <guoweikang.kernel(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/kmemleak.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/kmemleak.c~mm-kmemleak-fix-percpu-memory-leak-detection-failure +++ a/mm/kmemleak.c @@ -1093,7 +1093,7 @@ void __ref kmemleak_alloc_percpu(const v pr_debug("%s(0x%px, %zu)\n", __func__, ptr, size); if (kmemleak_enabled && ptr && !IS_ERR_PCPU(ptr)) - create_object_percpu((__force unsigned long)ptr, size, 0, gfp); + create_object_percpu((__force unsigned long)ptr, size, 1, gfp); } EXPORT_SYMBOL_GPL(kmemleak_alloc_percpu); _ Patches currently in -mm which might be from guoweikang.kernel(a)gmail.com are mm-shmem-refactor-to-reuse-vfs_parse_monolithic_sep-for-option-parsing.patch mm-early_ioremap-add-null-pointer-checks-to-prevent-null-pointer-dereference.patch mm-memblock-add-memblock_alloc_or_panic-interface.patch arch-s390-save_area_alloc-default-failure-behavior-changed-to-panic.patch mm-memmap-prevent-double-scanning-of-memmap-by-kmemleak.patch

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[folded-merged] hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode.patch removed from -mm tree

by Andrew Morton

The quilt patch titled Subject: hugetlb: fix NULL pointer dereference in trace_hugetlbfs_alloc_inode has been removed from the -mm tree. Its filename was hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode.patch This patch was dropped because it was folded into mm-fix-div-by-zero-in-bdi_ratio_from_pages-v2.patch ------------------------------------------------------ From: Muchun Song <songmuchun(a)bytedance.com> Subject: hugetlb: fix NULL pointer dereference in trace_hugetlbfs_alloc_inode Date: Mon, 6 Jan 2025 11:31:17 +0800 hugetlb_file_setup() will pass a NULL @dir to hugetlbfs_get_inode(), so we will access a NULL pointer for @dir. Fix it and set __entry->dr to 0 if @dir is NULL. Because ->i_ino cannot be 0 (see get_next_ino()), there is no confusing if user sees a 0 inode number. Link: https://lkml.kernel.org/r/20250106033118.4640-1-songmuchun@bytedance.com Fixes: 318580ad7f28 ("hugetlbfs: support tracepoint") Signed-off-by: Muchun Song <songmuchun(a)bytedance.com> Reported-by: Cheung Wall <zzqq0103.hey(a)gmail.com> Closes: https://lore.kernel.org/linux-mm/02858D60-43C1-4863-A84F-3C76A8AF1F15@linux… Reviewed-by: Hongbo Li <lihongbo22(a)huawei.com> Cc: cheung wall <zzqq0103.hey(a)gmail.com> Cc: Christian Brauner <brauner(a)kernel.org> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- include/trace/events/hugetlbfs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/trace/events/hugetlbfs.h~hugetlb-fix-null-pointer-dereference-in-trace_hugetlbfs_alloc_inode +++ a/include/trace/events/hugetlbfs.h @@ -23,7 +23,7 @@ TRACE_EVENT(hugetlbfs_alloc_inode, TP_fast_assign( __entry->dev = inode->i_sb->s_dev; __entry->ino = inode->i_ino; - __entry->dir = dir->i_ino; + __entry->dir = dir ? dir->i_ino : 0; __entry->mode = mode; ), _ Patches currently in -mm which might be from songmuchun(a)bytedance.com are mm-fix-div-by-zero-in-bdi_ratio_from_pages-v2.patch

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[PATCH v3 0/2] net/ncsi: fix oem gma command handling and state race issue

by Potin Lai

We are seeing kernel panic when enabling two NCSI interfaces at same time. It looks like mutex lock is being used in softirq caused the issue. This patch series try to fix oem gma command handling issue by adding a new state, also fix a potential state handling issue. Signed-off-by: Potin Lai <potin.lai.pt(a)gmail.com> --- Changes in v3: - Fix compile error by removing non-exist variable. - Link to v2: https://lore.kernel.org/r/20250111-fix-ncsi-mac-v2-0-838e0a1a233a@gmail.com Changes in v2: - Add second patch for fixing state handling issue. - Link to v1: https://lore.kernel.org/all/20250109145054.30925-1-fercerpav@gmail.com/ --- Cosmo Chou (1): net/ncsi: fix state race during channel probe completion Paul Fertser (1): net/ncsi: fix locking in Get MAC Address handling net/ncsi/internal.h | 2 ++ net/ncsi/ncsi-manage.c | 21 ++++++++++++++++++--- net/ncsi/ncsi-rsp.c | 19 ++++++------------- 3 files changed, 26 insertions(+), 16 deletions(-) --- base-commit: fc033cf25e612e840e545f8d5ad2edd6ba613ed5 change-id: 20250111-fix-ncsi-mac-1e4b3df431f1 Best regards, -- Potin Lai <potin.lai.pt(a)gmail.com>

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[PATCH] drm/amdgpu: fix backport of commit 73dae652dcac

by Alex Deucher

Commit 73dae652dcac ("drm/amdgpu: rework resume handling for display (v2)") missed a small code change when it was backported resulting in an automatic backlight control breakage. Fix the backport. Note that this patch is not in Linus' tree as it is not required there; the bug was introduced in the backport. Fixes: 99a02eab8251 ("drm/amdgpu: rework resume handling for display (v2)") Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3853 Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com> Cc: stable(a)vger.kernel.org # 6.11.x --- drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c index 51904906545e..45e28726e148 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c @@ -3721,8 +3721,12 @@ static int amdgpu_device_ip_resume_phase3(struct amdgpu_device *adev) continue; if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_DCE) { r = adev->ip_blocks[i].version->funcs->resume(adev); - if (r) + if (r) { + DRM_ERROR("resume of IP block <%s> failed %d\n", + adev->ip_blocks[i].version->funcs->name, r); return r; + } + adev->ip_blocks[i].status.hw = true; } } -- 2.47.1

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FAILED: patch "[PATCH] io_uring/eventfd: ensure io_eventfd_signal() defers another" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x c9a40292a44e78f71258b8522655bffaf5753bdb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025011245-hardy-tiptop-229e@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From c9a40292a44e78f71258b8522655bffaf5753bdb Mon Sep 17 00:00:00 2001 From: Jens Axboe <axboe(a)kernel.dk> Date: Wed, 8 Jan 2025 10:28:05 -0700 Subject: [PATCH] io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period. Fixes: 21a091b970cd ("io_uring: signal registered eventfd to process deferred task work") Reported-by: Jann Horn <jannh(a)google.com> Cc: stable(a)vger.kernel.org Tested-by: Li Zetao <lizetao1(a)huawei.com> Reviewed-by: Li Zetao<lizetao1(a)huawei.com> Reviewed-by: Prasanna Kumar T S M <ptsm(a)linux.microsoft.com> Signed-off-by: Jens Axboe <axboe(a)kernel.dk> diff --git a/io_uring/eventfd.c b/io_uring/eventfd.c index fab936d31ba8..100d5da94cb9 100644 --- a/io_uring/eventfd.c +++ b/io_uring/eventfd.c @@ -33,20 +33,18 @@ static void io_eventfd_free(struct rcu_head *rcu) kfree(ev_fd); } +static void io_eventfd_put(struct io_ev_fd *ev_fd) +{ + if (refcount_dec_and_test(&ev_fd->refs)) + call_rcu(&ev_fd->rcu, io_eventfd_free); +} + static void io_eventfd_do_signal(struct rcu_head *rcu) { struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE); - - if (refcount_dec_and_test(&ev_fd->refs)) - io_eventfd_free(rcu); -} - -static void io_eventfd_put(struct io_ev_fd *ev_fd) -{ - if (refcount_dec_and_test(&ev_fd->refs)) - call_rcu(&ev_fd->rcu, io_eventfd_free); + io_eventfd_put(ev_fd); } static void io_eventfd_release(struct io_ev_fd *ev_fd, bool put_ref)

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FAILED: patch "[PATCH] io_uring/eventfd: ensure io_eventfd_signal() defers another" failed to apply to 6.12-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x c9a40292a44e78f71258b8522655bffaf5753bdb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2025011244-expedited-clip-fd53@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From c9a40292a44e78f71258b8522655bffaf5753bdb Mon Sep 17 00:00:00 2001 From: Jens Axboe <axboe(a)kernel.dk> Date: Wed, 8 Jan 2025 10:28:05 -0700 Subject: [PATCH] io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period. Fixes: 21a091b970cd ("io_uring: signal registered eventfd to process deferred task work") Reported-by: Jann Horn <jannh(a)google.com> Cc: stable(a)vger.kernel.org Tested-by: Li Zetao <lizetao1(a)huawei.com> Reviewed-by: Li Zetao<lizetao1(a)huawei.com> Reviewed-by: Prasanna Kumar T S M <ptsm(a)linux.microsoft.com> Signed-off-by: Jens Axboe <axboe(a)kernel.dk> diff --git a/io_uring/eventfd.c b/io_uring/eventfd.c index fab936d31ba8..100d5da94cb9 100644 --- a/io_uring/eventfd.c +++ b/io_uring/eventfd.c @@ -33,20 +33,18 @@ static void io_eventfd_free(struct rcu_head *rcu) kfree(ev_fd); } +static void io_eventfd_put(struct io_ev_fd *ev_fd) +{ + if (refcount_dec_and_test(&ev_fd->refs)) + call_rcu(&ev_fd->rcu, io_eventfd_free); +} + static void io_eventfd_do_signal(struct rcu_head *rcu) { struct io_ev_fd *ev_fd = container_of(rcu, struct io_ev_fd, rcu); eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE); - - if (refcount_dec_and_test(&ev_fd->refs)) - io_eventfd_free(rcu); -} - -static void io_eventfd_put(struct io_ev_fd *ev_fd) -{ - if (refcount_dec_and_test(&ev_fd->refs)) - call_rcu(&ev_fd->rcu, io_eventfd_free); + io_eventfd_put(ev_fd); } static void io_eventfd_release(struct io_ev_fd *ev_fd, bool put_ref)

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[PATCH RESEND 0/5] can: c_can: One fix + simplify few things

by Krzysztof Kozlowski

One fix on which rest of the patches are based on (context changes). Not tested on hardware. Best regards, Krzysztof --- Krzysztof Kozlowski (5): can: c_can: Fix unbalanced runtime PM disable in error path can: c_can: Drop useless final probe failure message can: c_can: Simplify handling syscon error path can: c_can: Use of_property_present() to test existence of DT property can: c_can: Use syscon_regmap_lookup_by_phandle_args drivers/net/can/c_can/c_can_platform.c | 56 +++++++++++----------------------- 1 file changed, 18 insertions(+), 38 deletions(-) --- base-commit: df04532eb4413cfaf33a8a902d208f596ba7c1b0 change-id: 20250112-syscon-phandle-args-can-bd0b2067c4ad Best regards, -- Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>

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[PATCH 0/5] can: c_can: One fix + simplify few things

by Krzysztof Kozlowski

One fix on which rest of the patches are based on (context changes). Not tested on hardware. Best regards, Krzysztof --- Krzysztof Kozlowski (5): can: c_can: Fix unbalanced runtime PM disable in error path can: c_can: Drop useless final probe failure message can: c_can: Simplify handling syscon error path can: c_can: Use of_property_present() to test existence of DT property can: c_can: Use syscon_regmap_lookup_by_phandle_args drivers/net/can/c_can/c_can_platform.c | 56 +++++++++++----------------------- 1 file changed, 18 insertions(+), 38 deletions(-) --- base-commit: df04532eb4413cfaf33a8a902d208f596ba7c1b0 change-id: 20250112-syscon-phandle-args-can-bd0b2067c4ad Best regards, -- Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org>

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[PATCH 6.1.y] mm/mempolicy: fix migrate_to_node() assuming there is at least one VMA in a MM

by alvalan9＠foxmail.com

From: David Hildenbrand <david(a)redhat.com> [ Upstream commit 091c1dd2d4df6edd1beebe0e5863d4034ade9572 ] We currently assume that there is at least one VMA in a MM, which isn't true. So we might end up having find_vma() return NULL, to then de-reference NULL. So properly handle find_vma() returning NULL. This fixes the report: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6021 Comm: syz-executor284 Not tainted 6.12.0-rc7-syzkaller-00187-gf868cd251776 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:migrate_to_node mm/mempolicy.c:1090 [inline] RIP: 0010:do_migrate_pages+0x403/0x6f0 mm/mempolicy.c:1194 Code: ... RSP: 0018:ffffc9000375fd08 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc9000375fd78 RCX: 0000000000000000 RDX: ffff88807e171300 RSI: dffffc0000000000 RDI: ffff88803390c044 RBP: ffff88807e171428 R08: 0000000000000014 R09: fffffbfff2039ef1 R10: ffffffff901cf78f R11: 0000000000000000 R12: 0000000000000003 R13: ffffc9000375fe90 R14: ffffc9000375fe98 R15: ffffc9000375fdf8 FS: 00005555919e1380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555919e1ca8 CR3: 000000007f12a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> kernel_migrate_pages+0x5b2/0x750 mm/mempolicy.c:1709 __do_sys_migrate_pages mm/mempolicy.c:1727 [inline] __se_sys_migrate_pages mm/mempolicy.c:1723 [inline] __x64_sys_migrate_pages+0x96/0x100 mm/mempolicy.c:1723 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f [akpm(a)linux-foundation.org: add unlikely()] Link: https://lkml.kernel.org/r/20241120201151.9518-1-david@redhat.com Fixes: 39743889aaf7 ("[PATCH] Swap Migration V5: sys_migrate_pages interface") Signed-off-by: David Hildenbrand <david(a)redhat.com> Reported-by: syzbot+3511625422f7aa637f0d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/lkml/673d2696.050a0220.3c9d61.012f.GAE@google.com/T/ Reviewed-by: Liam R. Howlett <Liam.Howlett(a)Oracle.com> Reviewed-by: Christoph Lameter <cl(a)linux.com> Cc: Liam R. Howlett <Liam.Howlett(a)Oracle.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> [ Remove mmap_read_unlock() because mmap_read_lock() is not called before find_vma() ] Signed-off-by: Alva Lan <alvalan9(a)foxmail.com> --- mm/mempolicy.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 399d8cb48813..d67dd0f503fa 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1068,6 +1068,9 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest, * space range and MPOL_MF_DISCONTIG_OK, this call can not fail. */ vma = find_vma(mm, 0); + if (unlikely(!vma)) { + return 0; + } VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))); queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, flags | MPOL_MF_DISCONTIG_OK, &pagelist); -- 2.43.0

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Linux-stable-mirror January 2025