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    Subject[091/117] net: Fix oops from tcp_collapse() when using splice()
    2.6.33-stable review patch.  If anyone has any objections, please let us know.


    From: Steven J. Magnani <>

    [ Upstream commit baff42ab1494528907bf4d5870359e31711746ae ]

    tcp_read_sock() can have a eat skbs without immediately advancing copied_seq.
    This can cause a panic in tcp_collapse() if it is called as a result
    of the recv_actor dropping the socket lock.

    A userspace program that splices data from a socket to either another
    socket or to a file can trigger this bug.

    Signed-off-by: Steven J. Magnani <>
    Signed-off-by: David S. Miller <>
    Signed-off-by: Greg Kroah-Hartman <>
    net/ipv4/tcp.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/net/ipv4/tcp.c
    +++ b/net/ipv4/tcp.c
    @@ -1368,6 +1368,7 @@ int tcp_read_sock(struct sock *sk, read_
    sk_eat_skb(sk, skb, 0);
    if (!desc->count)
    + tp->copied_seq = seq;
    tp->copied_seq = seq;

     \ /
      Last update: 2010-05-12 10:17    [W:0.020 / U:7.036 seconds]
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