net: initialize skb->peeked when cloning

commit b13dda9f9aa7caceeee61c080c2e544d5f5d85e5 upstream.

syzbot reported __skb_try_recv_from_queue() was using skb->peeked
while it was potentially unitialized.

We need to clear it in __skb_clone()

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index fb422dfec8482c7f7f3c23d7e1eff10d8d7114a3..a40ccc184b8311652ee1e1884f65594d72b8c31a 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -903,6 +903,7 @@ static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb)
        n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len;
        n->cloned = 1;
        n->nohdr = 0;
+       n->peeked = 0;
        n->destructor = NULL;
        C(tail);
        C(end);