From: Eric Dumazet <edumazet@google.com>
Date: Sat, 7 Apr 2018 20:42:39 +0000 (-0700)
Subject: net: initialize skb->peeked when cloning
X-Git-Tag: v5.15~9065^2~14^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b13dda9f9aa7caceeee61c080c2e544d5f5d85e5;p=platform%2Fkernel%2Flinux-starfive.git

net: initialize skb->peeked when cloning

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>
---

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 1bca1e0..345b518 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -857,6 +857,7 @@ 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);