From b5ab677189b93efa4eaa921f42b21dc008247184 Mon Sep 17 00:00:00 2001
From: Steven Luo <steven+qemu@steven676.net>
Date: Wed, 6 Apr 2016 22:04:21 -0700
Subject: [PATCH] slirp: don't crash when tcp_sockclosed() is called with a
 NULL tp

Signed-off-by: Steven Luo <steven+qemu@steven676.net>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
 slirp/tcp_subr.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index dbfd2c673b..32ff452e93 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -356,6 +356,10 @@ tcp_sockclosed(struct tcpcb *tp)
 	DEBUG_CALL("tcp_sockclosed");
 	DEBUG_ARG("tp = %p", tp);
 
+	if (!tp) {
+		return;
+	}
+
 	switch (tp->t_state) {
 
 	case TCPS_CLOSED:
@@ -374,8 +378,7 @@ tcp_sockclosed(struct tcpcb *tp)
 		tp->t_state = TCPS_LAST_ACK;
 		break;
 	}
-	if (tp)
-		tcp_output(tp);
+	tcp_output(tp);
 }
 
 /*
-- 
2.39.2