To indicate an error, debugfs_create_file can return an ERR_PTR for !CONFIG_DEBUG_FS and NULL otherwise, so in case the result is dereferenced there should be a previous IS_ERR and a NULL check.
The Coccinelle semantic patch used to find the issue is as follows: @@ expression e; identifier f; @@
* e = debugfs_create_file(...); ... when != e == NULL e->f
Signed-off-by: Amitoj Kaur Chawla amitoj1606@gmail.com --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 8a1752f..9ff70a7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -1198,6 +1198,8 @@ static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev) adev, &amdgpu_ttm_vram_fops); if (IS_ERR(ent)) return PTR_ERR(ent); + if (!ent) + return -ENOMEM; i_size_write(ent->d_inode, adev->mc.mc_vram_size); adev->mman.vram = ent;
@@ -1205,6 +1207,8 @@ static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev) adev, &amdgpu_ttm_gtt_fops); if (IS_ERR(ent)) return PTR_ERR(ent); + if (!ent) + return -ENOMEM; i_size_write(ent->d_inode, adev->mc.gtt_size); adev->mman.gtt = ent;