4.9-stable review patch. If anyone has any objections, please let me know.
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From: Eric Dumazet edumazet@google.com
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
--- net/core/skbuff.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -903,6 +903,7 @@ static struct sk_buff *__skb_clone(struc 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);