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linux/drivers/scsi/mvsas
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Duoming Zhou 00d3af40b1 scsi: mvsas: Fix use-after-free bugs in mvs_work_queue 
[ Upstream commit 60cd16a3b7 ]

During the detaching of Marvell's SAS/SATA controller, the original code
calls cancel_delayed_work() in mvs_free() to cancel the delayed work
item mwq->work_q. However, if mwq->work_q is already running, the
cancel_delayed_work() may fail to cancel it. This can lead to
use-after-free scenarios where mvs_free() frees the mvs_info while
mvs_work_queue() is still executing and attempts to access the
already-freed mvs_info.

A typical race condition is illustrated below:

CPU 0 (remove)            | CPU 1 (delayed work callback)
mvs_pci_remove()          |
  mvs_free()              | mvs_work_queue()
    cancel_delayed_work() |
      kfree(mvi)          |
                          |   mvi-> // UAF

Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure
that the delayed work item is properly canceled and any executing
delayed work item completes before the mvs_info is deallocated.

This bug was found by static analysis.

Fixes: 20b09c2992 ("[SCSI] mvsas: add support for 94xx; layout change; bug fixes")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-19 16:33:38 +02:00
..
Kconfig scsi: Add HAS_IOPORT dependencies 2023-05-31 19:59:26 -04:00
Makefile treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_64xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_64xx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_94xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_94xx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_chips.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
mv_defs.h scsi: mvsas: Use sas_task_find_rq() for tagging 2022-10-22 03:02:52 +00:00
mv_init.c scsi: mvsas: Fix use-after-free bugs in mvs_work_queue 2025-10-19 16:33:38 +02:00
mv_sas.c scsi: mvsas: Fix dma_unmap_sg() nents value 2025-08-15 12:13:54 +02:00
mv_sas.h move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00