Hello Rex Zhu,
The patch 1e256e276221: "drm/amdgpu: Refine CSA related functions"
from Oct 15, 2018, leads to the following static checker warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c:49 amdgpu_allocate_static_csa()
error: uninitialized symbol 'ptr'.
drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
37 int amdgpu_allocate_static_csa(struct amdgpu_device *adev, struct
amdgpu_bo **bo,
38 u32 domain, uint32_t size)
39 {
40 int r;
41 void *ptr;
42
43 r = amdgpu_bo_create_kernel(adev, size, PAGE_SIZE,
44 domain, bo,
45 NULL, &ptr);
46 if (!bo)
^^^
We've already dereferenced "bo" at this point so this test doesn't work.
Smatch doesn't complain because it knows that all the caller pass a
valid "bo" pointer... Anyway probably this should just check if "r" is
non-zero.
47 return -ENOMEM;
48
49 memset(ptr, 0, size);
^^^
This is uninitialized if amdgpu_bo_create_kernel() fails.
50 return 0;
51 }
regards,
dan carpenter
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