From 0e398290cff997610b66e73573faaee70c9a700e Mon Sep 17 00:00:00 2001 From: Xie Yongji Date: Wed, 28 Jul 2021 21:07:55 +0800 Subject: vhost-vdpa: Fix integer overflow in vhost_vdpa_process_iotlb_update() 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 Signed-off-by: Xie Yongji Acked-by: Jason Wang Link: https://lore.kernel.org/r/20210728130756.97-1-xieyongji@bytedance.com Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vdpa.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 210ab35a7ebf..9479f7f79217 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -614,7 +614,8 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v, long pinned; int ret = 0; - if (msg->iova < v->range.first || + if (msg->iova < v->range.first || !msg->size || + msg->iova > U64_MAX - msg->size + 1 || msg->iova + msg->size - 1 > v->range.last) return -EINVAL; -- cgit v1.2.3