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linux/drivers/dma-buf
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Hyejeong Choi d0b7f11dd6 dma-buf: insert memory barrier before updating num_fences 
[ Upstream commit 72c7d62583 ]

smp_store_mb() inserts memory barrier after storing operation.
It is different with what the comment is originally aiming so Null
pointer dereference can be happened if memory update is reordered.

Signed-off-by: Hyejeong Choi <hjeong.choi@samsung.com>
Fixes: a590d0fdba ("dma-buf: Update reservation shared_count after adding the new fence")
CC: stable@vger.kernel.org
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250513020638.GA2329653@au1-maretx-p37.eng.sarc.samsung.com
Signed-off-by: Christian König <christian.koenig@amd.com>
[ adjusted `fobj->num_fences` to `fobj->shared_count` ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-09-09 18:50:23 +02:00
..
heaps dma-buf: heaps: Fix off-by-one in CMA heap fault handler 2024-10-17 15:10:37 +02:00
dma-buf-sysfs-stats.c dma-buf: Delete the DMA-BUF attachment sysfs statistics 2021-07-20 11:06:59 +02:00
dma-buf-sysfs-stats.h dma-buf: Delete the DMA-BUF attachment sysfs statistics 2021-07-20 11:06:59 +02:00
dma-buf.c dma-buf/poll: Get a file reference for outstanding fence callbacks 2022-07-12 16:34:51 +02:00
dma-fence-array.c dma-buf: fix dma_fence_array_signaled v4 2024-12-14 19:51:33 +01:00
dma-fence-chain.c dma-buf: some dma_fence_chain improvements 2021-06-14 19:33:16 +02:00
dma-fence-unwrap.c dma-buf: add dma_fence_timestamp helper 2024-02-23 08:55:10 +01:00
dma-fence.c drm/syncobj: use newly allocated stub fences 2021-04-08 12:21:13 +02:00
dma-heap.c dma-buf: fix racing conflict of dma_heap_add() 2022-12-02 17:41:06 +01:00
dma-resv.c dma-buf: insert memory barrier before updating num_fences 2025-09-09 18:50:23 +02:00
Kconfig dma-buf: DMABUF_SYSFS_STATS should depend on DMA_SHARED_BUFFER 2021-09-07 12:42:21 +05:30
Makefile dmabuf: Add the capability to expose DMA-BUF stats in sysfs 2021-06-15 11:50:24 +02:00
selftest.c dma-buf: Introduce selftesting framework 2019-08-19 18:01:34 +01:00
selftest.h dma-buf: Introduce selftesting framework 2019-08-19 18:01:34 +01:00
selftests.h Merge drm/drm-next into drm-intel-next-queued 2020-06-25 18:05:03 +03:00
seqno-fence.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
st-dma-fence-chain.c dma-buf: add dma_fence_chain_alloc/free v3 2021-06-14 19:38:34 +02:00
st-dma-fence.c dma-buf: Avoid comma separated statements 2021-02-09 17:14:11 +01:00
sw_sync.c dma-buf/sw_sync: Avoid recursive lock during fence signal 2023-08-30 16:18:21 +02:00
sync_debug.c dma-buf/sw-sync: don't enable IRQ from sync_print_obj() 2024-06-16 13:39:49 +02:00
sync_debug.h dma-buf: Remove unused sync_dump() 2019-04-23 09:30:07 +01:00
sync_file.c dma-buf: add dma_fence_timestamp helper 2024-02-23 08:55:10 +01:00
sync_trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udmabuf.c udmabuf: use sgtable-based scatterlist wrappers 2025-06-27 11:05:34 +01:00