在 2021/7/16 下午6:22, Xie Yongji 写道:
The "msg->iova + msg->size" addition can have an integer overflow
if the iotlb message is from a malicious user space application.
So let's fix it.
Fixes: 1b48dc03e575 ("vhost: vdpa: report iova range")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vhost/vdpa.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 210ab35a7ebf..8e3c8790d493 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -615,6 +615,7 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
int ret = 0;
if (msg->iova < v->range.first ||
+ msg->iova - 1 > U64_MAX - msg->size ||
msg->iova + msg->size - 1 > v->range.last)
return -EINVAL;
