drm/radeon: fix underflow in r600_cp_dispatch_texture()

The "if (pass_size > buf->total)" can underflow so I have changed the
type of size and pass_size to unsigned to avoid this problem.

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>

diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
index 09e3f39925faa832661e59333bed740981c10621..98f9adaccc3dadfc75c85ff5a7cbdf9994e48abc 100644 (file)
--- a/drivers/gpu/drm/radeon/r600_cp.c
+++ b/drivers/gpu/drm/radeon/r600_cp.c
@@ -2483,7 +2483,7 @@ int r600_cp_dispatch_texture(struct drm_device *dev,
        struct drm_buf *buf;
        u32 *buffer;
        const u8 __user *data;
-       int size, pass_size;
+       unsigned int size, pass_size;
        u64 src_offset, dst_offset;
 
        if (!radeon_check_offset(dev_priv, tex->offset)) {