From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Wed, 30 Jan 2013 09:26:42 +0000 (+0000)
Subject: ipv6 flowlabel: Ensure to take lock when modifying np->ip6_sk_fl_list.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f256dc59d0729cf7d371b93062375d9bc79c1e44;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ipv6 flowlabel: Ensure to take lock when modifying np->ip6_sk_fl_list.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 29124b7a04c8..5d767f1b8780 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -255,10 +255,19 @@ void fl6_free_socklist(struct sock *sk)
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct ipv6_fl_socklist *sfl;
 
-	while ((sfl = np->ipv6_fl_list) != NULL) {
-		np->ipv6_fl_list = sfl->next;
+	if (!np->ipv6_fl_list)
+		return;
+
+	write_lock_bh(&ipv6_sk_fl_lock);
+	sfl = np->ipv6_fl_list;
+	np->ipv6_fl_list = NULL;
+	write_unlock_bh(&ipv6_sk_fl_lock);
+
+	while (sfl) {
+		struct ipv6_fl_socklist *next = sfl->next;
 		fl_release(sfl->fl);
 		kfree(sfl);
+		sfl = next;
 	}
 }