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-rw-r--r--net/caif/caif_socket.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index abcba5358b63..2eca2dd0000f 100644
--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -819,6 +819,7 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
long timeo;
int err;
int ifindex, headroom, tailroom;
+ unsigned int mtu;
struct net_device *dev;
lock_sock(sk);
@@ -888,14 +889,22 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
goto out;
}
- dev = dev_get_by_index(sock_net(sk), ifindex);
+
+ err = -ENODEV;
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
+ if (!dev) {
+ rcu_read_unlock();
+ goto out;
+ }
cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom);
+ mtu = dev->mtu;
+ rcu_read_unlock();
+
cf_sk->tailroom = tailroom;
- cf_sk->maxframe = dev->mtu - (headroom + tailroom);
- dev_put(dev);
+ cf_sk->maxframe = mtu - (headroom + tailroom);
if (cf_sk->maxframe < 1) {
pr_warn("CAIF Interface MTU too small (%d)\n", dev->mtu);
- err = -ENODEV;
goto out;
}

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