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drm/radeon: integer underflow in radeon_cp_dispatch_texture()

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The test:

	if (size > RADEON_MAX_TEXTURE_SIZE) {

"size" is an integer and it's controled by the user so it can be
negative and the test can underflow.  Later we use "size" in:

	dwords = size / 4;
	...
	RADEON_COPY_MT(buffer, data, (int)(dwords * sizeof(u32)));

It causes memory corruption to copy a negative size buffer.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2014-12-23 12:56:49 +03:00 committed by Alex Deucher
parent 02ae7af53a
commit dd5a74f2f9
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/radeon/radeon_state.c
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@ -1703,7 +1703,7 @@ static int radeon_cp_dispatch_texture(struct drm_device * dev,
u32 format;
u32 *buffer;
const u8 __user *data;
int size, dwords, tex_width, blit_width, spitch;
unsigned int size, dwords, tex_width, blit_width, spitch;
u32 height;
int i;
u32 texpitch, microtile;