drm/radeon: integer overflow in radeon_mode_dumb_create()

Similar to the handling of amdgpu_mode_dumb_create in commit 54ef0b54
("drm/amdgpu: integer overflow in amdgpu_mode_dumb_create()"),
we thought a patch might be needed here as well.

args->size is a u64.  arg->pitch and args->height are u32.  The
multiplication will overflow instead of using the high 32 bits as
intended.
Signed-off-by: NXiaohui Zhang <xiaohuizhang@ruc.edu.cn>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_gem.c

@@ -833,7 +833,7 @@ int radeon_mode_dumb_create(struct drm_file *file_priv,
 
 	args->pitch = radeon_align_pitch(rdev, args->width,
 					 DIV_ROUND_UP(args->bpp, 8), 0);
-	args->size = args->pitch * args->height;
+	args->size = (u64)args->pitch * args->height;
 	args->size = ALIGN(args->size, PAGE_SIZE);
 
 	r = radeon_gem_object_create(rdev, args->size, 0,