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[merged mm-hotfixes-stable] mm-close-theoretical-race-where-stale-tlb-entries-could-linger.patch removed from -mm tree

by Andrew Morton

The quilt patch titled Subject: mm: close theoretical race where stale TLB entries could linger has been removed from the -mm tree. Its filename was mm-close-theoretical-race-where-stale-tlb-entries-could-linger.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: Ryan Roberts <ryan.roberts(a)arm.com> Subject: mm: close theoretical race where stale TLB entries could linger Date: Fri, 6 Jun 2025 10:28:07 +0100 Commit 3ea277194daa ("mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries") described a theoretical race as such: """ Nadav Amit identified a theoretical race between page reclaim and mprotect due to TLB flushes being batched outside of the PTL being held. He described the race as follows: CPU0 CPU1 ---- ---- user accesses memory using RW PTE [PTE now cached in TLB] try_to_unmap_one() ==> ptep_get_and_clear() ==> set_tlb_ubc_flush_pending() mprotect(addr, PROT_READ) ==> change_pte_range() ==> [ PTE non-present - no flush ] user writes using cached RW PTE ... try_to_unmap_flush() The same type of race exists for reads when protecting for PROT_NONE and also exists for operations that can leave an old TLB entry behind such as munmap, mremap and madvise. """ The solution was to introduce flush_tlb_batched_pending() and call it under the PTL from mprotect/madvise/munmap/mremap to complete any pending tlb flushes. However, while madvise_free_pte_range() and madvise_cold_or_pageout_pte_range() were both retro-fitted to call flush_tlb_batched_pending() immediately after initially acquiring the PTL, they both temporarily release the PTL to split a large folio if they stumble upon one. In this case, where re-acquiring the PTL flush_tlb_batched_pending() must be called again, but it previously was not. Let's fix that. There are 2 Fixes: tags here: the first is the commit that fixed madvise_free_pte_range(). The second is the commit that added madvise_cold_or_pageout_pte_range(), which looks like it copy/pasted the faulty pattern from madvise_free_pte_range(). This is a theoretical bug discovered during code review. Link: https://lkml.kernel.org/r/20250606092809.4194056-1-ryan.roberts@arm.com Fixes: 3ea277194daa ("mm, mprotect: flush TLB if potentially racing with a parallel reclaim leaving stale TLB entries") Fixes: 9c276cc65a58 ("mm: introduce MADV_COLD") Signed-off-by: Ryan Roberts <ryan.roberts(a)arm.com> Reviewed-by: Jann Horn <jannh(a)google.com> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Liam Howlett <liam.howlett(a)oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Mel Gorman <mgorman <mgorman(a)suse.de> Cc: Vlastimil Babka <vbabka(a)suse.cz> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/madvise.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/madvise.c~mm-close-theoretical-race-where-stale-tlb-entries-could-linger +++ a/mm/madvise.c @@ -508,6 +508,7 @@ restart: pte_offset_map_lock(mm, pmd, addr, &ptl); if (!start_pte) break; + flush_tlb_batched_pending(mm); arch_enter_lazy_mmu_mode(); if (!err) nr = 0; @@ -741,6 +742,7 @@ static int madvise_free_pte_range(pmd_t start_pte = pte; if (!start_pte) break; + flush_tlb_batched_pending(mm); arch_enter_lazy_mmu_mode(); if (!err) nr = 0; _ Patches currently in -mm which might be from ryan.roberts(a)arm.com are mm-readahead-honour-new_order-in-page_cache_ra_order.patch mm-readahead-terminate-async-readahead-on-natural-boundary.patch mm-readahead-make-space-in-struct-file_ra_state.patch mm-readahead-store-folio-order-in-struct-file_ra_state.patch mm-filemap-allow-arch-to-request-folio-size-for-exec-memory.patch mm-remove-arch_flush_tlb_batched_pending-arch-helper.patch

3 weeks, 1 day

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[merged mm-hotfixes-stable] mm-vma-reset-vma-iterator-on-commit_merge-oom-failure.patch removed from -mm tree

by Andrew Morton

The quilt patch titled Subject: mm/vma: reset VMA iterator on commit_merge() OOM failure has been removed from the -mm tree. Its filename was mm-vma-reset-vma-iterator-on-commit_merge-oom-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: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Subject: mm/vma: reset VMA iterator on commit_merge() OOM failure Date: Fri, 6 Jun 2025 13:50:32 +0100 While an OOM failure in commit_merge() isn't really feasible due to the allocation which might fail (a maple tree pre-allocation) being 'too small to fail', we do need to handle this case correctly regardless. In vma_merge_existing_range(), we can theoretically encounter failures which result in an OOM error in two ways - firstly dup_anon_vma() might fail with an OOM error, and secondly commit_merge() failing, ultimately, to pre-allocate a maple tree node. The abort logic for dup_anon_vma() resets the VMA iterator to the initial range, ensuring that any logic looping on this iterator will correctly proceed to the next VMA. However the commit_merge() abort logic does not do the same thing. This resulted in a syzbot report occurring because mlockall() iterates through VMAs, is tolerant of errors, but ended up with an incorrect previous VMA being specified due to incorrect iterator state. While making this change, it became apparent we are duplicating logic - the logic introduced in commit 41e6ddcaa0f1 ("mm/vma: add give_up_on_oom option on modify/merge, use in uffd release") duplicates the vmg->give_up_on_oom check in both abort branches. Additionally, we observe that we can perform the anon_dup check safely on dup_anon_vma() failure, as this will not be modified should this call fail. Finally, we need to reset the iterator in both cases, so now we can simply use the exact same code to abort for both. We remove the VM_WARN_ON(err != -ENOMEM) as it would be silly for this to be otherwise and it allows us to implement the abort check more neatly. Link: https://lkml.kernel.org/r/20250606125032.164249-1-lorenzo.stoakes@oracle.com Fixes: 47b16d0462a4 ("mm: abort vma_modify() on merge out of memory failure") Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Reported-by: syzbot+d16409ea9ecc16ed261a(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/linux-mm/6842cc67.a00a0220.29ac89.003b.GAE@google.c… Reviewed-by: Pedro Falcato <pfalcato(a)suse.de> Reviewed-by: Vlastimil Babka <vbabka(a)suse.cz> Reviewed-by: Liam R. Howlett <Liam.Howlett(a)oracle.com> Cc: Jann Horn <jannh(a)google.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/vma.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) --- a/mm/vma.c~mm-vma-reset-vma-iterator-on-commit_merge-oom-failure +++ a/mm/vma.c @@ -967,26 +967,9 @@ static __must_check struct vm_area_struc err = dup_anon_vma(next, middle, &anon_dup); } - if (err) + if (err || commit_merge(vmg)) goto abort; - err = commit_merge(vmg); - if (err) { - VM_WARN_ON(err != -ENOMEM); - - if (anon_dup) - unlink_anon_vmas(anon_dup); - - /* - * We've cleaned up any cloned anon_vma's, no VMAs have been - * modified, no harm no foul if the user requests that we not - * report this and just give up, leaving the VMAs unmerged. - */ - if (!vmg->give_up_on_oom) - vmg->state = VMA_MERGE_ERROR_NOMEM; - return NULL; - } - khugepaged_enter_vma(vmg->target, vmg->flags); vmg->state = VMA_MERGE_SUCCESS; return vmg->target; @@ -995,6 +978,9 @@ abort: vma_iter_set(vmg->vmi, start); vma_iter_load(vmg->vmi); + if (anon_dup) + unlink_anon_vmas(anon_dup); + /* * This means we have failed to clone anon_vma's correctly, but no * actual changes to VMAs have occurred, so no harm no foul - if the _ Patches currently in -mm which might be from lorenzo.stoakes(a)oracle.com are mm-add-mmap_prepare-compatibility-layer-for-nested-file-systems.patch mm-add-mmap_prepare-compatibility-layer-for-nested-file-systems-fix-2.patch docs-mm-expand-vma-doc-to-highlight-pte-freeing-non-vma-traversal.patch mm-ksm-have-ksm-vma-checks-not-require-a-vma-pointer.patch mm-ksm-refer-to-special-vmas-via-vm_special-in-ksm_compatible.patch mm-prevent-ksm-from-breaking-vma-merging-for-new-vmas.patch tools-testing-selftests-add-vma-merge-tests-for-ksm-merge.patch mm-pagewalk-split-walk_page_range_novma-into-kernel-user-parts.patch mm-mremap-introduce-more-mergeable-mremap-via-mremap_relocate_anon.patch mm-mremap-add-mremap_must_relocate_anon.patch mm-mremap-add-mremap_relocate_anon-support-for-large-folios.patch tools-uapi-update-copy-of-linux-mmanh-from-the-kernel-sources.patch tools-testing-selftests-add-sys_mremap-helper-to-vm_utilh.patch tools-testing-selftests-add-mremap-cases-that-merge-normally.patch tools-testing-selftests-add-mremap_relocate_anon-merge-test-cases.patch tools-testing-selftests-expand-mremap-tests-for-mremap_relocate_anon.patch tools-testing-selftests-have-cow-self-test-use-mremap_relocate_anon.patch tools-testing-selftests-test-relocate-anon-in-split-huge-page-test.patch tools-testing-selftests-add-mremap_relocate_anon-fork-tests.patch

3 weeks, 1 day

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[PATCH v6] clk: qcom: dispcc-sm8750: Fix setting rate byte and pixel clocks

by Krzysztof Kozlowski

On SM8750 the setting rate of pixel and byte clocks, while the parent DSI PHY PLL, fails with: disp_cc_mdss_byte0_clk_src: rcg didn't update its configuration. DSI PHY PLL has to be unprepared and its "PLL Power Down" bits in CMN_CTRL_0 asserted. Mark these clocks with CLK_OPS_PARENT_ENABLE to ensure the parent is enabled during rate changes. Cc: <stable(a)vger.kernel.org> Fixes: f1080d8dab0f ("clk: qcom: dispcc-sm8750: Add SM8750 Display clock controller") Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski(a)linaro.org> --- Changes in v6: 1. Add CLK_OPS_PARENT_ENABLE also to pclk1, pclk2 and byte1. 2. Add Fixes tag and cc-stable Previously part of v5 (thus b4 diff might not work nice here): https://lore.kernel.org/r/20250430-b4-sm8750-display-v5-6-8cab30c3e4df@lina… Changes in v5: 1. New patch in above patchset. Cc: Abhinav Kumar <quic_abhinavk(a)quicinc.com> Cc: Dmitry Baryshkov <lumag(a)kernel.org> --- drivers/clk/qcom/dispcc-sm8750.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/clk/qcom/dispcc-sm8750.c b/drivers/clk/qcom/dispcc-sm8750.c index 877b40d50e6f..ca09da111a50 100644 --- a/drivers/clk/qcom/dispcc-sm8750.c +++ b/drivers/clk/qcom/dispcc-sm8750.c @@ -393,7 +393,7 @@ static struct clk_rcg2 disp_cc_mdss_byte0_clk_src = { .name = "disp_cc_mdss_byte0_clk_src", .parent_data = disp_cc_parent_data_1, .num_parents = ARRAY_SIZE(disp_cc_parent_data_1), - .flags = CLK_SET_RATE_PARENT, + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE, .ops = &clk_byte2_ops, }, }; @@ -408,7 +408,7 @@ static struct clk_rcg2 disp_cc_mdss_byte1_clk_src = { .name = "disp_cc_mdss_byte1_clk_src", .parent_data = disp_cc_parent_data_1, .num_parents = ARRAY_SIZE(disp_cc_parent_data_1), - .flags = CLK_SET_RATE_PARENT, + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE, .ops = &clk_byte2_ops, }, }; @@ -712,7 +712,7 @@ static struct clk_rcg2 disp_cc_mdss_pclk0_clk_src = { .name = "disp_cc_mdss_pclk0_clk_src", .parent_data = disp_cc_parent_data_1, .num_parents = ARRAY_SIZE(disp_cc_parent_data_1), - .flags = CLK_SET_RATE_PARENT, + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE, .ops = &clk_pixel_ops, }, }; @@ -727,7 +727,7 @@ static struct clk_rcg2 disp_cc_mdss_pclk1_clk_src = { .name = "disp_cc_mdss_pclk1_clk_src", .parent_data = disp_cc_parent_data_1, .num_parents = ARRAY_SIZE(disp_cc_parent_data_1), - .flags = CLK_SET_RATE_PARENT, + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE, .ops = &clk_pixel_ops, }, }; @@ -742,7 +742,7 @@ static struct clk_rcg2 disp_cc_mdss_pclk2_clk_src = { .name = "disp_cc_mdss_pclk2_clk_src", .parent_data = disp_cc_parent_data_1, .num_parents = ARRAY_SIZE(disp_cc_parent_data_1), - .flags = CLK_SET_RATE_PARENT, + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE, .ops = &clk_pixel_ops, }, }; -- 2.45.2

3 weeks, 1 day

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[PATCH] clk: qcom: gcc-ipq8074: fix broken freq table for nss_port6_tx_clk_src

by Christian Marangi

With the conversion done by commit e88f03230dc0 ("clk: qcom: gcc-ipq8074: rework nss_port5/6 clock to multiple conf") a Copy-Paste error was made for the nss_port6_tx_clk_src frequency table. This was caused by the wrong setting of the parent in ftbl_nss_port6_tx_clk_src that was wrongly set to P_UNIPHY1_RX instead of P_UNIPHY2_TX. This cause the UNIPHY2 port to malfunction when it needs to be scaled to higher clock. The malfunction was observed with the example scenario with an Aquantia 10G PHY connected and a speed higher than 1G (example 2.5G) Fix the broken frequency table to restore original functionality. Cc: stable(a)vger.kernel.org Fixes: e88f03230dc0 ("clk: qcom: gcc-ipq8074: rework nss_port5/6 clock to multiple conf") Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> --- drivers/clk/qcom/gcc-ipq8074.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c index 7258ba5c0900..1329ea28d703 100644 --- a/drivers/clk/qcom/gcc-ipq8074.c +++ b/drivers/clk/qcom/gcc-ipq8074.c @@ -1895,10 +1895,10 @@ static const struct freq_conf ftbl_nss_port6_tx_clk_src_125[] = { static const struct freq_multi_tbl ftbl_nss_port6_tx_clk_src[] = { FMS(19200000, P_XO, 1, 0, 0), FM(25000000, ftbl_nss_port6_tx_clk_src_25), - FMS(78125000, P_UNIPHY1_RX, 4, 0, 0), + FMS(78125000, P_UNIPHY2_TX, 4, 0, 0), FM(125000000, ftbl_nss_port6_tx_clk_src_125), - FMS(156250000, P_UNIPHY1_RX, 2, 0, 0), - FMS(312500000, P_UNIPHY1_RX, 1, 0, 0), + FMS(156250000, P_UNIPHY2_TX, 2, 0, 0), + FMS(312500000, P_UNIPHY2_TX, 1, 0, 0), { } }; -- 2.48.1

3 weeks, 1 day

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[PATCH RESEND 5.10.y 0/4] serial: sh-sci: Backport fixes

by Claudiu

From: Claudiu Beznea <claudiu.beznea.uj(a)bp.renesas.com> Hi, Commit 653143ed73ec ("serial: sh-sci: Check if TX data was written to device in .tx_empty()") doesn't apply cleanly on top of v5.10.y stable tree. This series adjust it. Along with it, propose for backporting other sh-sci fixes. Please provide your feedback. Thank you, Claudiu Beznea Claudiu Beznea (4): serial: sh-sci: Check if TX data was written to device in .tx_empty() serial: sh-sci: Move runtime PM enable to sci_probe_single() serial: sh-sci: Clean sci_ports[0] after at earlycon exit serial: sh-sci: Increment the runtime usage counter for the earlycon device drivers/tty/serial/sh-sci.c | 97 ++++++++++++++++++++++++++++++------- 1 file changed, 79 insertions(+), 18 deletions(-) -- 2.43.0

3 weeks, 1 day

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[PATCH 6.1.y 0/4] serial: sh-sci: Backport fixes

by Claudiu

From: Claudiu Beznea <claudiu.beznea.uj(a)bp.renesas.com> Hi, Commit 653143ed73ec ("serial: sh-sci: Check if TX data was written to device in .tx_empty()") doesn't apply cleanly on top of v6.1.y stable tree. This series adjust it. Along with it, propose for backporting other sh-sci fixes. Please provide your feedback. Thank you, Claudiu Beznea Claudiu Beznea (4): serial: sh-sci: Check if TX data was written to device in .tx_empty() serial: sh-sci: Move runtime PM enable to sci_probe_single() serial: sh-sci: Clean sci_ports[0] after at earlycon exit serial: sh-sci: Increment the runtime usage counter for the earlycon device drivers/tty/serial/sh-sci.c | 97 ++++++++++++++++++++++++++++++------- 1 file changed, 79 insertions(+), 18 deletions(-) -- 2.43.0

3 weeks, 1 day

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[PATCH 5.15.y 0/4] serial: sh-sci: Backport fixes

by Claudiu

From: Claudiu Beznea <claudiu.beznea.uj(a)bp.renesas.com> Hi, Commit 653143ed73ec ("serial: sh-sci: Check if TX data was written to device in .tx_empty()") doesn't apply cleanly on top of v5.15.y stable tree. This series adjust it. Along with it, propose for backporting other sh-sci fixes. Please provide your feedback. Thank you, Claudiu Beznea Claudiu Beznea (4): serial: sh-sci: Check if TX data was written to device in .tx_empty() serial: sh-sci: Move runtime PM enable to sci_probe_single() serial: sh-sci: Clean sci_ports[0] after at earlycon exit serial: sh-sci: Increment the runtime usage counter for the earlycon device drivers/tty/serial/sh-sci.c | 97 ++++++++++++++++++++++++++++++------- 1 file changed, 79 insertions(+), 18 deletions(-) -- 2.43.0

3 weeks, 1 day

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[PATCH 5.4.y] NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes

by Larry Bassel

From: Chuck Lever <chuck.lever(a)oracle.com> [ Upstream commit a648fdeb7c0e17177a2280344d015dba3fbe3314 ] iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large. Cc: stable(a)vger.kernel.org Signed-off-by: Chuck Lever <chuck.lever(a)oracle.com> (cherry picked from commit a648fdeb7c0e17177a2280344d015dba3fbe3314) [Larry: backport to 5.4.y. Minor conflict resolved due to missing commit 9cde9360d18d NFSD: Update the SETATTR3args decoder to use struct xdr_stream] Signed-off-by: Larry Bassel <larry.bassel(a)oracle.com> --- fs/nfsd/nfs3xdr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index 03e8c45a52f3..25b6b4db0af2 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -122,7 +122,7 @@ decode_sattr3(__be32 *p, struct iattr *iap, struct user_namespace *userns) iap->ia_valid |= ATTR_SIZE; p = xdr_decode_hyper(p, &newsize); - iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX); + iap->ia_size = newsize; } if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ iap->ia_valid |= ATTR_ATIME; -- 2.46.0

3 weeks, 1 day

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[PATCH 6.6.y 0/4] serial: sh-sci: Backport fixes

by Claudiu

From: Claudiu Beznea <claudiu.beznea.uj(a)bp.renesas.com> Hi, Commit 653143ed73ec ("serial: sh-sci: Check if TX data was written to device in .tx_empty()") doesn't apply cleanly on top of v6.6.y stable tree. This series adjust it. Along with it, propose for backporting other sh-sci fixes. Please provide your feedback. Thank you, Claudiu Beznea Claudiu Beznea (4): serial: sh-sci: Check if TX data was written to device in .tx_empty() serial: sh-sci: Move runtime PM enable to sci_probe_single() serial: sh-sci: Clean sci_ports[0] after at earlycon exit serial: sh-sci: Increment the runtime usage counter for the earlycon device drivers/tty/serial/sh-sci.c | 97 ++++++++++++++++++++++++++++++------- 1 file changed, 79 insertions(+), 18 deletions(-) -- 2.43.0

3 weeks, 1 day

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[PATCH 5.4.y] NFSD: Fix ia_size underflow

by Larry Bassel

From: Chuck Lever <chuck.lever(a)oracle.com> [ Upstream commit e6faac3f58c7c4176b66f63def17a34232a17b0e ] iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and NFSv4 both define file size as an unsigned 64-bit type. Thus there is a range of valid file size values an NFS client can send that is already larger than Linux can handle. Currently decode_fattr4() dumps a full u64 value into ia_size. If that value happens to be larger than S64_MAX, then ia_size underflows. I'm about to fix up the NFSv3 behavior as well, so let's catch the underflow in the common code path: nfsd_setattr(). Cc: stable(a)vger.kernel.org Signed-off-by: Chuck Lever <chuck.lever(a)oracle.com> (cherry picked from commit e6faac3f58c7c4176b66f63def17a34232a17b0e) [Larry: backport to 5.4.y. Minor conflict resolved due to missing commit 2f221d6f7b88 attr: handle idmapped mounts] Signed-off-by: Larry Bassel <larry.bassel(a)oracle.com> --- fs/nfsd/vfs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 6aa968bee0ce..bee4fdf6e239 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -448,6 +448,10 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, .ia_size = iap->ia_size, }; + host_err = -EFBIG; + if (iap->ia_size < 0) + goto out_unlock; + host_err = notify_change(dentry, &size_attr, NULL); if (host_err) goto out_unlock; -- 2.46.0

3 weeks, 1 day

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