tcp: Clear sk_send_head after purging the write queue

Denis Andzakovic discovered a potential use-after-free in older kernel
versions, using syzkaller.  tcp_write_queue_purge() frees all skbs in
the TCP write queue and can leave sk->sk_send_head pointing to freed
memory.  tcp_disconnect() clears that pointer after calling
tcp_write_queue_purge(), but tcp_connect() does not.  It is
(surprisingly) possible to add to the write queue between
disconnection and reconnection, so this needs to be done in both
places.

This bug was introduced by backports of commit 7f582b248d0a ("tcp:
purge write queue in tcp_connect_init()") and does not exist upstream
because of earlier changes in commit 75c119afe14f ("tcp: implement
rb-tree based retransmit queue").  The latter is a major change that's
not suitable for stable.

Reported-by: Denis Andzakovic <denis.andzakovic@pulsesecurity.co.nz>
Bisected-by: Salvatore Bonaccorso <carnil@debian.org>
Fixes: 7f582b248d0a ("tcp: purge write queue in tcp_connect_init()")
Cc: <stable@vger.kernel.org> # before 4.15
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7994e569644e0c017d08c66484545de2a14002f4..9de2c8cdcc512eec721c689d58b65bacc3030a4f 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1613,6 +1613,8 @@ static inline void tcp_init_send_head(struct sock *sk)
        sk->sk_send_head = NULL;
 }
 
+static inline void tcp_init_send_head(struct sock *sk);
+
 /* write queue abstraction */
 static inline void tcp_write_queue_purge(struct sock *sk)
 {
@@ -1621,6 +1623,7 @@ static inline void tcp_write_queue_purge(struct sock *sk)
        tcp_chrono_stop(sk, TCP_CHRONO_BUSY);
        while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL)
                sk_wmem_free_skb(sk, skb);
+       tcp_init_send_head(sk);
        sk_mem_reclaim(sk);
        tcp_clear_all_retrans_hints(tcp_sk(sk));
        tcp_init_send_head(sk);