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drm/amd/amdgpu/amdgpu_ttm: Handle return NULL error from ioremap_nocache 

Here, If ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Arvind Yadav 2017-01-24 14:55:33 +05:30 committed by Alex Deucher
parent 967de2a9dc
commit 8ba28ac9f5
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@ -548,6 +548,8 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
mem->bus.addr =
ioremap_nocache(mem->bus.base + mem->bus.offset,
mem->bus.size);
if (!mem->bus.addr)
return -ENOMEM;
/*
* Alpha: Use just the bus offset plus