[patch] drm/radeon: integer underflow in radeon_cp_dispatch_texture()

[Dan Carpenter]

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 at oracle.com>
---
Static checkers complain about the integer overflows here, and there are
many real overflows but they appear harmless.

diff --git a/drivers/gpu/drm/radeon/radeon_state.c 
b/drivers/gpu/drm/radeon/radeon_state.c
index 535403e..15aee72 100644
--- a/drivers/gpu/drm/radeon/radeon_state.c
+++ b/drivers/gpu/drm/radeon/radeon_state.c
@@ -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;