2.6.22-stable review patch. If anyone has any objections, please let us know. ------------------ From: Ilpo Järvinen [TCP] MTUprobe: fix potential sk_send_head corruption [ Upstream commit: 6e42141009ff18297fe19d19296738b742f861db ] When the abstraction functions got added, conversion here was made incorrectly. As a result, the skb may end up pointing to skb which got included to the probe skb and then was freed. For it to trigger, however, skb_transmit must fail sending as well. Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller Cc: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- include/net/tcp.h | 3 +++ net/ipv4/tcp_output.c | 1 - 2 files changed, 3 insertions(+), 1 deletion(-) --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1258,6 +1258,9 @@ static inline void tcp_insert_write_queu struct sock *sk) { __skb_insert(new, skb->prev, skb, &sk->sk_write_queue); + + if (sk->sk_send_head == skb) + sk->sk_send_head = new; } static inline void tcp_unlink_write_queue(struct sk_buff *skb, struct sock *sk) --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1279,7 +1279,6 @@ static int tcp_mtu_probe(struct sock *sk skb = tcp_send_head(sk); tcp_insert_write_queue_before(nskb, skb, sk); - tcp_advance_send_head(sk, skb); TCP_SKB_CB(nskb)->seq = TCP_SKB_CB(skb)->seq; TCP_SKB_CB(nskb)->end_seq = TCP_SKB_CB(skb)->seq + probe_size; -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/