Commit a8e56b80 authored by xinhui pan's avatar xinhui pan Committed by Alex Deucher

drm/amdgpu: Fix a use-after-free

looks like we forget to set ttm->sg to NULL.
Hit panic below

[ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI
[ 1235.989074] Call Trace:
[ 1235.991751]  sg_free_table+0x17/0x20
[ 1235.995667]  amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu]
[ 1236.002288]  amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu]
[ 1236.008464]  ttm_tt_destroy+0x1e/0x30 [ttm]
[ 1236.013066]  ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm]
[ 1236.018783]  ttm_bo_release+0x262/0xa50 [ttm]
[ 1236.023547]  ttm_bo_put+0x82/0xd0 [ttm]
[ 1236.027766]  amdgpu_bo_unref+0x26/0x50 [amdgpu]
[ 1236.032809]  amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu]
[ 1236.040400]  kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu]
[ 1236.046912]  kfd_ioctl+0x463/0x690 [amdgpu]
Signed-off-by: default avatarxinhui pan <xinhui.pan@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 7230362c
...@@ -1166,6 +1166,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev, ...@@ -1166,6 +1166,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
if (gtt && gtt->userptr) { if (gtt && gtt->userptr) {
amdgpu_ttm_tt_set_user_pages(ttm, NULL); amdgpu_ttm_tt_set_user_pages(ttm, NULL);
kfree(ttm->sg); kfree(ttm->sg);
ttm->sg = NULL;
ttm->page_flags &= ~TTM_PAGE_FLAG_SG; ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
return; return;
} }
......
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