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drm/amdgpu: return -EFAULT if copy_to_user() fails 

The copy_to_user() function returns the number of bytes remaining to be
copied, but we want to return a negative error code to the user.

Fixes: 030d5b97a5 ("drm/amdgpu: use amdgpu_device_vram_access in amdgpu_ttm_vram_read")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2020-02-12 15:07:59 +03:00 committed by Alex Deucher
parent 72b4c01d66
commit 434cbcb1bd
1 changed files with 2 additions and 4 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@ -2290,7 +2290,6 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
{
struct amdgpu_device *adev = file_inode(f)->i_private;
ssize_t result = 0;
int r;
if (size & 0x3 || *pos & 0x3)
return -EINVAL;
@ -2304,9 +2303,8 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
uint32_t value[AMDGPU_TTM_VRAM_MAX_DW_READ];
amdgpu_device_vram_access(adev, *pos, value, bytes, false);
r = copy_to_user(buf, value, bytes);
if (r)
return r;
if (copy_to_user(buf, value, bytes))
return -EFAULT;
result += bytes;
buf += bytes;