drm/savage: fix integer overflows in savage_bci_cmdbuf()
Since cmdbuf->size and cmdbuf->nbox are from userspace, a large value
would overflow the allocation size, leading to out-of-bounds access.
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/savage/savage_state.c b/drivers/gpu/drm/savage/savage_state.c
index 031aaaf..b6d8608 100644
--- a/drivers/gpu/drm/savage/savage_state.c
+++ b/drivers/gpu/drm/savage/savage_state.c
@@ -988,7 +988,7 @@
* for locking on FreeBSD.
*/
if (cmdbuf->size) {
- kcmd_addr = kmalloc(cmdbuf->size * 8, GFP_KERNEL);
+ kcmd_addr = kmalloc_array(cmdbuf->size, 8, GFP_KERNEL);
if (kcmd_addr == NULL)
return -ENOMEM;
@@ -1015,8 +1015,8 @@
cmdbuf->vb_addr = kvb_addr;
}
if (cmdbuf->nbox) {
- kbox_addr = kmalloc(cmdbuf->nbox * sizeof(struct drm_clip_rect),
- GFP_KERNEL);
+ kbox_addr = kmalloc_array(cmdbuf->nbox, sizeof(struct drm_clip_rect),
+ GFP_KERNEL);
if (kbox_addr == NULL) {
ret = -ENOMEM;
goto done;