From e6e8869aed897a021fafa6f412e9e4b7e2ea6cd3 Mon Sep 17 00:00:00 2001
From: Li RongQing <lirongqing@baidu.com>
Date: Fri, 9 Nov 2018 17:04:51 +0800
Subject: [PATCH] net: tcp: remove BUG_ON from tcp_v4_err

if skb is NULL pointer, and the following access of skb's
skb_mstamp_ns will trigger panic, which is same as BUG_ON

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp_ipv4.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a336787d75e5..5424a4077c27 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -542,7 +542,6 @@ int tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
 		icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX);
 
 		skb = tcp_rtx_queue_head(sk);
-		BUG_ON(!skb);
 
 		tcp_mstamp_refresh(tp);
 		delta_us = (u32)(tp->tcp_mstamp - tcp_skb_timestamp_us(skb));