From: Jason Wang jasowang@redhat.com
[ Upstream commit 813dbeb656d6c90266f251d8bd2b02d445afa63f ]
We used to accept zero size iova range which will lead a infinite loop in translate_desc(). Fixing this by failing the request in this case.
Reported-by: syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com Fixes: 6b1e6cc7 ("vhost: new device IOTLB API") Signed-off-by: Jason Wang jasowang@redhat.com Acked-by: Michael S. Tsirkin mst@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/vhost/vhost.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -918,8 +918,12 @@ static int vhost_new_umem_range(struct v u64 start, u64 size, u64 end, u64 userspace_addr, int perm) { - struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC); + struct vhost_umem_node *tmp, *node;
+ if (!size) + return -EFAULT; + + node = kmalloc(sizeof(*node), GFP_ATOMIC); if (!node) return -ENOMEM;