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    Subject[ 083/180] netem: fix possible skb leak
    2.6.32-longterm review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Eric Dumazet <edumazet@google.com>

    [ Upstream commit 116a0fc31c6c9b8fc821be5a96e5bf0b43260131 ]

    skb_checksum_help(skb) can return an error, we must free skb in this
    case. qdisc_drop(skb, sch) can also be feeded with a NULL skb (if
    skb_unshare() failed), so lets use this generic helper.

    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Cc: Stephen Hemminger <shemminger@osdl.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Willy Tarreau <w@1wt.eu>
    ---
    net/sched/sch_netem.c | 10 ++++------
    1 files changed, 4 insertions(+), 6 deletions(-)

    diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
    index 2b88295..0ae345a 100644
    --- a/net/sched/sch_netem.c
    +++ b/net/sched/sch_netem.c
    @@ -199,12 +199,10 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
    * do it now in software before we mangle it.
    */
    if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) {
    - if (!(skb = skb_unshare(skb, GFP_ATOMIC))
    - || (skb->ip_summed == CHECKSUM_PARTIAL
    - && skb_checksum_help(skb))) {
    - sch->qstats.drops++;
    - return NET_XMIT_DROP;
    - }
    + if (!(skb = skb_unshare(skb, GFP_ATOMIC)) ||
    + (skb->ip_summed == CHECKSUM_PARTIAL &&
    + skb_checksum_help(skb)))
    + return qdisc_drop(skb, sch);

    skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8);
    }
    --
    1.7.2.1.45.g54fbc




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