diff options
author | Guchun Chen <guchun.chen@amd.com> | 2021-03-30 17:52:18 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 10:57:20 +0200 |
commit | db506a8d97886a5b24e77f127cc66d1ddf59e0d3 (patch) | |
tree | c8b1ca4b3b2c51194715bb3501266368888f1202 /drivers/gpu | |
parent | 164d29ace7d5cb94a61eab5a9af921fc27ea9ed7 (diff) |
drm/amdgpu: fix NULL pointer dereference
[ Upstream commit 3c3dc654333f6389803cdcaf03912e94173ae510 ]
ttm->sg needs to be checked before accessing its child member.
Call Trace:
amdgpu_ttm_backend_destroy+0x12/0x70 [amdgpu]
ttm_bo_cleanup_memtype_use+0x3a/0x60 [ttm]
ttm_bo_release+0x17d/0x300 [ttm]
amdgpu_bo_unref+0x1a/0x30 [amdgpu]
amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x78b/0x8b0 [amdgpu]
kfd_ioctl_alloc_memory_of_gpu+0x118/0x220 [amdgpu]
kfd_ioctl+0x222/0x400 [amdgpu]
? kfd_dev_is_large_bar+0x90/0x90 [amdgpu]
__x64_sys_ioctl+0x8e/0xd0
? __context_tracking_exit+0x52/0x90
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f97f264d317
Code: b3 66 90 48 8b 05 71 4b 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 41 4b 2d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdb402c338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f97f3cc63a0 RCX: 00007f97f264d317
RDX: 00007ffdb402c380 RSI: 00000000c0284b16 RDI: 0000000000000003
RBP: 00007ffdb402c380 R08: 00007ffdb402c428 R09: 00000000c4000004
R10: 00000000c4000004 R11: 0000000000000246 R12: 00000000c0284b16
R13: 0000000000000003 R14: 00007f97f3cc63a0 R15: 00007f8836200000
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index ae700e445fbc..d057bc29bf4c 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -742,7 +742,7 @@ static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm) DMA_BIDIRECTIONAL : DMA_TO_DEVICE; /* double check that we don't free the table twice */ - if (!ttm->sg->sgl) + if (!ttm->sg || !ttm->sg->sgl) return; /* free the sg table and pages again */ |