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drm/amd/amdgpu: Return error if initiating read out of range on vram

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commit 9156e72330 upstream.

If you initiate a read that is out of the VRAM address space return
ENXIO instead of 0.

Reads that begin below that point will read upto the VRAM limit as
before.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tom St Denis
2017-05-23 11:35:22 -04:00
committed by Greg Kroah-Hartman
parent a89b6e355d
commit ad2efae461
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
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@@ -1126,6 +1126,9 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
if (size & 0x3 || *pos & 0x3)
return -EINVAL;
if (*pos >= adev->mc.mc_vram_size)
return -ENXIO;
while (size) {
unsigned long flags;
uint32_t value;