Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6e42141009ff18297fe19d19296738b742f861db Commit: 6e42141009ff18297fe19d19296738b742f861db Parent: 1f8170b0ecd8363847792b3b1f269e9d8e10391a Author: Ilpo J�rvinen <[EMAIL PROTECTED]> AuthorDate: Mon Nov 19 23:24:09 2007 -0800 Committer: David S. Miller <[EMAIL PROTECTED]> CommitDate: Mon Nov 19 23:24:09 2007 -0800
[TCP] MTUprobe: fix potential sk_send_head corruption 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 J�rvinen <[EMAIL PROTECTED]> Signed-off-by: David S. Miller <[EMAIL PROTECTED]> --- include/net/tcp.h | 3 +++ net/ipv4/tcp_output.c | 1 - 2 files changed, 3 insertions(+), 1 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index d695cea..cb5b033 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1288,6 +1288,9 @@ static inline void tcp_insert_write_queue_before(struct sk_buff *new, 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) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 324b420..e48e28e 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1352,7 +1352,6 @@ 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 git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html