From: Eugenio Pérez Date: Thu, 5 Mar 2020 16:30:05 +0000 (+0100) Subject: vhost: Check docket sk_family instead of call getname X-Git-Tag: v4.9.216~38 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7f574e92e4474f1b33425c4ee9ba48cd4fbe7d75;p=thirdparty%2Fkernel%2Fstable.git vhost: Check docket sk_family instead of call getname [ Upstream commit 42d84c8490f9f0931786f1623191fcab397c3d64 ] Doing so, we save one call to get data we already have in the struct. Also, since there is no guarantee that getname use sockaddr_ll parameter beyond its size, we add a little bit of security here. It should do not do beyond MAX_ADDR_LEN, but syzbot found that ax25_getname writes more (72 bytes, the size of full_sockaddr_ax25, versus 20 + 32 bytes of sockaddr_ll + MAX_ADDR_LEN in syzbot repro). Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Reported-by: syzbot+f2a62d07a5198c819c7b@syzkaller.appspotmail.com Signed-off-by: Eugenio Pérez Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index dd8798bf88e7c..861f43f8f9cea 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -914,11 +914,7 @@ static int vhost_net_release(struct inode *inode, struct file *f) static struct socket *get_raw_socket(int fd) { - struct { - struct sockaddr_ll sa; - char buf[MAX_ADDR_LEN]; - } uaddr; - int uaddr_len = sizeof uaddr, r; + int r; struct socket *sock = sockfd_lookup(fd, &r); if (!sock) @@ -930,12 +926,7 @@ static struct socket *get_raw_socket(int fd) goto err; } - r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, - &uaddr_len, 0); - if (r) - goto err; - - if (uaddr.sa.sll_family != AF_PACKET) { + if (sock->sk->sk_family != AF_PACKET) { r = -EPFNOSUPPORT; goto err; }