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[PATCH v2 1/1] fuse: fix readahead reclaim deadlock

by Joanne Koong

Commit e26ee4efbc79 ("fuse: allocate ff->release_args only if release is needed") skips allocating ff->release_args if the server does not implement open. However in doing so, fuse_prepare_release() now skips grabbing the reference on the inode, which makes it possible for an inode to be evicted from the dcache while there are inflight readahead requests. This causes a deadlock if the server triggers reclaim while servicing the readahead request and reclaim attempts to evict the inode of the file being read ahead. Since the folio is locked during readahead, when reclaim evicts the fuse inode and fuse_evict_inode() attempts to remove all folios associated with the inode from the page cache (truncate_inode_pages_range()), reclaim will block forever waiting for the lock since readahead cannot relinquish the lock because it is itself blocked in reclaim: >>> stack_trace(1504735) folio_wait_bit_common (mm/filemap.c:1308:4) folio_lock (./include/linux/pagemap.h:1052:3) truncate_inode_pages_range (mm/truncate.c:336:10) fuse_evict_inode (fs/fuse/inode.c:161:2) evict (fs/inode.c:704:3) dentry_unlink_inode (fs/dcache.c:412:3) __dentry_kill (fs/dcache.c:615:3) shrink_kill (fs/dcache.c:1060:12) shrink_dentry_list (fs/dcache.c:1087:3) prune_dcache_sb (fs/dcache.c:1168:2) super_cache_scan (fs/super.c:221:10) do_shrink_slab (mm/shrinker.c:435:9) shrink_slab (mm/shrinker.c:626:10) shrink_node (mm/vmscan.c:5951:2) shrink_zones (mm/vmscan.c:6195:3) do_try_to_free_pages (mm/vmscan.c:6257:3) do_swap_page (mm/memory.c:4136:11) handle_pte_fault (mm/memory.c:5562:10) handle_mm_fault (mm/memory.c:5870:9) do_user_addr_fault (arch/x86/mm/fault.c:1338:10) handle_page_fault (arch/x86/mm/fault.c:1481:3) exc_page_fault (arch/x86/mm/fault.c:1539:2) asm_exc_page_fault+0x22/0x27 Fix this deadlock by allocating ff->release_args and grabbing the reference on the inode when preparing the file for release even if the server does not implement open. The inode reference will be dropped when the last reference on the fuse file is dropped (see fuse_file_put() -> fuse_release_end()). Fixes: e26ee4efbc79 ("fuse: allocate ff->release_args only if release is needed") Cc: stable(a)vger.kernel.org Signed-off-by: Joanne Koong <joannelkoong(a)gmail.com> Reported-by: Omar Sandoval <osandov(a)fb.com> --- fs/fuse/file.c | 40 ++++++++++++++++++++++++++-------------- 1 file changed, 26 insertions(+), 14 deletions(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index f1ef77a0be05..654e21ee93fb 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -100,7 +100,7 @@ static void fuse_release_end(struct fuse_mount *fm, struct fuse_args *args, kfree(ra); } -static void fuse_file_put(struct fuse_file *ff, bool sync) +static void fuse_file_put(struct fuse_file *ff, bool sync, bool isdir) { if (refcount_dec_and_test(&ff->count)) { struct fuse_release_args *ra = &ff->args->release_args; @@ -110,7 +110,9 @@ static void fuse_file_put(struct fuse_file *ff, bool sync) fuse_file_io_release(ff, ra->inode); if (!args) { - /* Do nothing when server does not implement 'open' */ + /* Do nothing when server does not implement 'opendir' */ + } else if (!isdir && ff->fm->fc->no_open) { + fuse_release_end(ff->fm, args, 0); } else if (sync) { fuse_simple_request(ff->fm, args); fuse_release_end(ff->fm, args, 0); @@ -131,8 +133,17 @@ struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid, struct fuse_file *ff; int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; bool open = isdir ? !fc->no_opendir : !fc->no_open; + bool release = !isdir || open; - ff = fuse_file_alloc(fm, open); + /* + * ff->args->release_args still needs to be allocated (so we can hold an + * inode reference while there are pending inflight file operations when + * ->release() is called, see fuse_prepare_release()) even if + * fc->no_open is set else it becomes possible for reclaim to deadlock + * if while servicing the readahead request the server triggers reclaim + * and reclaim evicts the inode of the file being read ahead. + */ + ff = fuse_file_alloc(fm, release); if (!ff) return ERR_PTR(-ENOMEM); @@ -152,13 +163,14 @@ struct fuse_file *fuse_file_open(struct fuse_mount *fm, u64 nodeid, fuse_file_free(ff); return ERR_PTR(err); } else { - /* No release needed */ - kfree(ff->args); - ff->args = NULL; - if (isdir) + if (isdir) { + /* No release needed */ + kfree(ff->args); + ff->args = NULL; fc->no_opendir = 1; - else + } else { fc->no_open = 1; + } } } @@ -363,7 +375,7 @@ void fuse_file_release(struct inode *inode, struct fuse_file *ff, * own ref to the file, the IO completion has to drop the ref, which is * how the fuse server can end up closing its clients' files. */ - fuse_file_put(ff, false); + fuse_file_put(ff, false, isdir); } void fuse_release_common(struct file *file, bool isdir) @@ -394,7 +406,7 @@ void fuse_sync_release(struct fuse_inode *fi, struct fuse_file *ff, { WARN_ON(refcount_read(&ff->count) > 1); fuse_prepare_release(fi, ff, flags, FUSE_RELEASE, true); - fuse_file_put(ff, true); + fuse_file_put(ff, true, false); } EXPORT_SYMBOL_GPL(fuse_sync_release); @@ -891,7 +903,7 @@ static void fuse_readpages_end(struct fuse_mount *fm, struct fuse_args *args, folio_put(ap->folios[i]); } if (ia->ff) - fuse_file_put(ia->ff, false); + fuse_file_put(ia->ff, false, false); fuse_io_free(ia); } @@ -1815,7 +1827,7 @@ static void fuse_writepage_free(struct fuse_writepage_args *wpa) if (wpa->bucket) fuse_sync_bucket_dec(wpa->bucket); - fuse_file_put(wpa->ia.ff, false); + fuse_file_put(wpa->ia.ff, false, false); kfree(ap->folios); kfree(wpa); @@ -1968,7 +1980,7 @@ int fuse_write_inode(struct inode *inode, struct writeback_control *wbc) ff = __fuse_write_file_get(fi); err = fuse_flush_times(inode, ff); if (ff) - fuse_file_put(ff, false); + fuse_file_put(ff, false, false); return err; } @@ -2186,7 +2198,7 @@ static int fuse_iomap_writeback_submit(struct iomap_writepage_ctx *wpc, } if (data->ff) - fuse_file_put(data->ff, false); + fuse_file_put(data->ff, false, false); return error; } -- 2.47.3

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Mejora la gestión de compensaciones en tu empresa

by Daniel Rodríguez

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1 month, 2 weeks

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[PATCH] coresight: etm-perf: Fix reference count leak in etm_setup_aux

by Ma Ke

In etm_setup_aux(), when a user sink is obtained via coresight_get_sink_by_id(), it increments the reference count of the sink device. However, if the sink is used in path building, the path holds a reference, but the initial reference from coresight_get_sink_by_id() is not released, causing a reference count leak. We should release the initial reference after the path is built. Found by code review. Cc: stable(a)vger.kernel.org Fixes: 0e6c20517596 ("coresight: etm-perf: Allow an event to use different sinks") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- drivers/hwtracing/coresight/coresight-etm-perf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index f677c08233ba..6584f6aa87bf 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -453,6 +453,11 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, if (!event_data->snk_config) goto err; + if (user_sink) { + put_device(&user_sink->dev); + user_sink = NULL; + } + out: return event_data; -- 2.17.1

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[PATCH] net: fealnx: fixed possible out of band acces to an array

by Ilya Krutskih

fixed possible out of band access to an array If the fealnx_init_one() function is called more than MAX_UNITS times or card_idx is less than zero Added a check: 0 <= card_idx < MAX_UNITS Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Ilya Krutskih <devsec(a)tpz.ru> --- drivers/net/ethernet/fealnx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/fealnx.c b/drivers/net/ethernet/fealnx.c index 6ac8547ef9b8..c7f2141a01fe 100644 --- a/drivers/net/ethernet/fealnx.c +++ b/drivers/net/ethernet/fealnx.c @@ -491,8 +491,8 @@ static int fealnx_init_one(struct pci_dev *pdev, card_idx++; sprintf(boardname, "fealnx%d", card_idx); - - option = card_idx < MAX_UNITS ? options[card_idx] : 0; + if (card_idx >= 0) + option = card_idx < MAX_UNITS ? options[card_idx] : 0; i = pci_enable_device(pdev); if (i) return i; @@ -623,7 +623,7 @@ static int fealnx_init_one(struct pci_dev *pdev, np->default_port = option & 15; } - if (card_idx < MAX_UNITS && full_duplex[card_idx] > 0) + if ((0 <= card_idx && MAX_UNITS > card_idx) && full_duplex[card_idx] > 0) np->mii.full_duplex = full_duplex[card_idx]; if (np->mii.full_duplex) { -- 2.43.0

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[PATCH] intel_th: Fix error handling in intel_th_output_open

by Ma Ke

intel_th_output_open() calls bus_find_device_by_devt() which internally increments the device reference count via get_device(), but this reference is not properly released in several error paths. When device driver is unavailable, file operations cannot be obtained, or the driver's open method fails, the function returns without calling put_device(), leading to a permanent device reference count leak. This prevents the device from being properly released and could cause resource exhaustion over time. Found by code review. Cc: stable(a)vger.kernel.org Fixes: 39f4034693b7 ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices") Signed-off-by: Ma Ke <make24(a)iscas.ac.cn> --- drivers/hwtracing/intel_th/core.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 47d9e6c3bac0..ecc4b4ff5cf6 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -811,12 +811,12 @@ static int intel_th_output_open(struct inode *inode, struct file *file) dev = bus_find_device_by_devt(&intel_th_bus, inode->i_rdev); if (!dev || !dev->driver) - return -ENODEV; + goto out_no_device; thdrv = to_intel_th_driver(dev->driver); fops = fops_get(thdrv->fops); if (!fops) - return -ENODEV; + goto out_put_device; replace_fops(file, fops); @@ -824,10 +824,16 @@ static int intel_th_output_open(struct inode *inode, struct file *file) if (file->f_op->open) { err = file->f_op->open(inode, file); - return err; + if (err) + goto out_put_device; } return 0; + +out_put_device: + put_device(dev); +out_no_device: + return err; } static const struct file_operations intel_th_output_fops = { -- 2.17.1

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[PATCH v12 1/3] NFSD: Make FILE_SYNC WRITEs comply with spec

by Chuck Lever

From: Chuck Lever <chuck.lever(a)oracle.com> Mike noted that when NFSD responds to an NFS_FILE_SYNC WRITE, it does not also persist file time stamps. To wit, Section 18.32.3 of RFC 8881 mandates: > The client specifies with the stable parameter the method of how > the data is to be processed by the server. If stable is > FILE_SYNC4, the server MUST commit the data written plus all file > system metadata to stable storage before returning results. This > corresponds to the NFSv2 protocol semantics. Any other behavior > constitutes a protocol violation. If stable is DATA_SYNC4, then > the server MUST commit all of the data to stable storage and > enough of the metadata to retrieve the data before returning. Commit 3f3503adb332 ("NFSD: Use vfs_iocb_iter_write()") replaced: - flags |= RWF_SYNC; with: + kiocb.ki_flags |= IOCB_DSYNC; which appears to be correct given: if (flags & RWF_SYNC) kiocb_flags |= IOCB_DSYNC; in kiocb_set_rw_flags(). However the author of that commit did not appreciate that the previous line in kiocb_set_rw_flags() results in IOCB_SYNC also being set: kiocb_flags |= (__force int) (flags & RWF_SUPPORTED); RWF_SUPPORTED contains RWF_SYNC, and RWF_SYNC is the same bit as IOCB_SYNC. Reviewers at the time did not catch the omission. Reported-by: Mike Snitzer <snitzer(a)kernel.org> Closes: https://lore.kernel.org/linux-nfs/20251018005431.3403-1-cel@kernel.org/T/#t Fixes: 3f3503adb332 ("NFSD: Use vfs_iocb_iter_write()") Cc: stable(a)vger.kernel.org Reviewed-by: Jeff Layton <jlayton(a)kernel.org> Reviewed-by: NeilBrown <neil(a)brown.name> Reviewed-by: Christoph Hellwig <hch(a)lst.de> Signed-off-by: Chuck Lever <chuck.lever(a)oracle.com> --- fs/nfsd/vfs.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index f537a7b4ee01..5333d49910d9 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -1314,8 +1314,18 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, stable = NFS_UNSTABLE; init_sync_kiocb(&kiocb, file); kiocb.ki_pos = offset; - if (stable && !fhp->fh_use_wgather) - kiocb.ki_flags |= IOCB_DSYNC; + if (likely(!fhp->fh_use_wgather)) { + switch (stable) { + case NFS_FILE_SYNC: + /* persist data and timestamps */ + kiocb.ki_flags |= IOCB_DSYNC | IOCB_SYNC; + break; + case NFS_DATA_SYNC: + /* persist data only */ + kiocb.ki_flags |= IOCB_DSYNC; + break; + } + } nvecs = xdr_buf_to_bvec(rqstp->rq_bvec, rqstp->rq_maxpages, payload); iov_iter_bvec(&iter, ITER_SOURCE, rqstp->rq_bvec, nvecs, *cnt); -- 2.51.0

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[PATCH v2] usb: mtu3: fix possible NULL pointer dereference in ep0_rx_state()

by Pavel Zhigulin

The function 'ep0_rx_state()' accessed 'mreq->request' before verifying that mreq was valid. If 'next_ep0_request()' returned NULL, this could lead to a NULL pointer dereference. The return value of 'next_ep0_request()' is checked in every other code path except here. It appears that the intended 'if (mreq)' check was mistakenly written as 'if (req)', since the req pointer cannot be NULL when mreq is not NULL. Initialize 'mreq' and 'req' to NULL by default, and switch 'req' NULL-checking to 'mreq' non-NULL check to prevent invalid memory access. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: df2069acb005 ("usb: Add MediaTek USB3 DRD driver") Signed-off-by: Pavel Zhigulin <Pavel.Zhigulin(a)kaspersky.com> --- v2: Add <stable(a)vger.kernel.org> to CC list v1: https://lore.kernel.org/all/20251027193152.3906497-1-Pavel.Zhigulin@kaspers… drivers/usb/mtu3/mtu3_gadget_ep0.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/mtu3/mtu3_gadget_ep0.c b/drivers/usb/mtu3/mtu3_gadget_ep0.c index e4fd1bb14a55..ee7466ca4d99 100644 --- a/drivers/usb/mtu3/mtu3_gadget_ep0.c +++ b/drivers/usb/mtu3/mtu3_gadget_ep0.c @@ -508,8 +508,8 @@ static int handle_standard_request(struct mtu3 *mtu, /* receive an data packet (OUT) */ static void ep0_rx_state(struct mtu3 *mtu) { - struct mtu3_request *mreq; - struct usb_request *req; + struct mtu3_request *mreq = NULL; + struct usb_request *req = NULL; void __iomem *mbase = mtu->mac_base; u32 maxp; u32 csr; @@ -519,10 +519,11 @@ static void ep0_rx_state(struct mtu3 *mtu) csr = mtu3_readl(mbase, U3D_EP0CSR) & EP0_W1C_BITS; mreq = next_ep0_request(mtu); - req = &mreq->request; /* read packet and ack; or stall because of gadget driver bug */ - if (req) { + if (mreq) { + req = &mreq->request; + void *buf = req->buf + req->actual; unsigned int len = req->length - req->actual; -- 2.43.0

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[PATCH v2] EDAC/altera: Use INTTEST register for Ethernet and USB SBE injection

by niravkumarlaxmidas.rabara＠altera.com

From: Niravkumar L Rabara <niravkumarlaxmidas.rabara(a)altera.com> The current single-bit error injection mechanism flips bits directly in ECC RAM by performing write and read operations. When the ECC RAM is actively used by the Ethernet or USB controller, this approach sometimes trigger a false double-bit error. Switch both Ethernet and USB EDAC devices to use the INTTEST register (altr_edac_a10_device_inject_fops) for single-bit error injection, similar to the existing double-bit error injection method. Fixes: 064acbd4f4ab ("EDAC, altera: Add Stratix10 peripheral support") Cc: stable(a)vger.kernel.org Signed-off-by: Niravkumar L Rabara <niravkumarlaxmidas.rabara(a)altera.com> --- v2 changes: - Add missing Cc tag v1 link: https://lore.kernel.org/all/20251101051723.917688-1-niravkumarlaxmidas.raba… drivers/edac/altera_edac.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 103b2c2eba2a..5c5d4585d8ae 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -1357,7 +1357,7 @@ static const struct edac_device_prv_data a10_enetecc_data = { .ue_set_mask = ALTR_A10_ECC_TDERRA, .set_err_ofst = ALTR_A10_ECC_INTTEST_OFST, .ecc_irq_handler = altr_edac_a10_ecc_irq, - .inject_fops = &altr_edac_a10_device_inject2_fops, + .inject_fops = &altr_edac_a10_device_inject_fops, }; #endif /* CONFIG_EDAC_ALTERA_ETHERNET */ @@ -1447,7 +1447,7 @@ static const struct edac_device_prv_data a10_usbecc_data = { .ue_set_mask = ALTR_A10_ECC_TDERRA, .set_err_ofst = ALTR_A10_ECC_INTTEST_OFST, .ecc_irq_handler = altr_edac_a10_ecc_irq, - .inject_fops = &altr_edac_a10_device_inject2_fops, + .inject_fops = &altr_edac_a10_device_inject_fops, }; #endif /* CONFIG_EDAC_ALTERA_USB */ -- 2.25.1

1 month, 2 weeks

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[PATCH v2] EDAC/altera: Handle OCRAM ECC enable after warm reset

by niravkumarlaxmidas.rabara＠altera.com

From: Niravkumar L Rabara <niravkumarlaxmidas.rabara(a)altera.com> The OCRAM ECC is always enabled either by the BootROM or by the Secure Device Manager (SDM) during a power-on reset on SoCFPGA. However, during a warm reset, the OCRAM content is retained to preserve data, while the control and status registers are reset to their default values. As a result, ECC must be explicitly re-enabled after a warm reset. Fixes: 17e47dc6db4f ("EDAC/altera: Add Stratix10 OCRAM ECC support") Cc: stable(a)vger.kernel.org Signed-off-by: Niravkumar L Rabara <niravkumarlaxmidas.rabara(a)altera.com> Acked-by: Dinh Nguyen <dinguyen(a)kernel.org> --- v2 changes: - Add Fixes and Cc tags - Retains Acked-by from v1 patch v1 link: https://lore.kernel.org/all/20251103140920.1060643-1-niravkumarlaxmidas.rab… drivers/edac/altera_edac.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 103b2c2eba2a..a776d61027f2 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -1184,10 +1184,22 @@ altr_check_ocram_deps_init(struct altr_edac_device_dev *device) if (ret) return ret; - /* Verify OCRAM has been initialized */ + /* + * Verify that OCRAM has been initialized. + * During a warm reset, OCRAM contents are retained, but the control + * and status registers are reset to their default values. Therefore, + * ECC must be explicitly re-enabled in the control register. + * Error condition: if INITCOMPLETEA is clear and ECC_EN is already set. + */ if (!ecc_test_bits(ALTR_A10_ECC_INITCOMPLETEA, - (base + ALTR_A10_ECC_INITSTAT_OFST))) - return -ENODEV; + (base + ALTR_A10_ECC_INITSTAT_OFST))) { + if (!ecc_test_bits(ALTR_A10_ECC_EN, + (base + ALTR_A10_ECC_CTRL_OFST))) + ecc_set_bits(ALTR_A10_ECC_EN, + (base + ALTR_A10_ECC_CTRL_OFST)); + else + return -ENODEV; + } /* Enable IRQ on Single Bit Error */ writel(ALTR_A10_ECC_SERRINTEN, (base + ALTR_A10_ECC_ERRINTENS_OFST)); -- 2.25.1

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[PATCH 0/2] fuse: Fix missing fuse_copy_finish in dev_uring.c

by Bernd Schubert

Both argument copies in dev_uring.c miss fuse_copy_finish. Signed-off-by: Bernd Schubert <bschubert(a)ddn.com> --- Bernd Schubert (1): fuse: Fix whitespace for fuse_uring_args_to_ring() comment Cheng Ding (1): fuse: missing copy_finish in fuse-over-io-uring argument copies fs/fuse/dev.c | 2 +- fs/fuse/dev_uring.c | 18 ++++++++++++------ fs/fuse/fuse_dev_i.h | 1 + 3 files changed, 14 insertions(+), 7 deletions(-) --- base-commit: 6548d364a3e850326831799d7e3ea2d7bb97ba08 change-id: 20251021-io-uring-fixes-copy-finish-07ae602e2ab1 Best regards, -- Bernd Schubert <bschubert(a)ddn.com>

1 month, 2 weeks

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