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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>
This commit is contained in:
Li RongQing 2018-11-09 17:04:51 +08:00 committed by David S. Miller
parent 307f39b021
commit e6e8869aed
1 changed files with 0 additions and 1 deletions
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net/ipv4/tcp_ipv4.c
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@ -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));