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 <eperezma@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index dd8798bf88e7c0b9095248227368c7a981f8d562..861f43f8f9ceab0fb9b86145c7a1b14191da191f 100644 (file)
--- 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;
        }