From bd0bf57700cb0eaa92f3d2ee040a69743cdd99d0 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Thu, 18 Oct 2007 05:15:57 -0700 Subject: [PATCH] [IPV6]: Lost locking in fl6_sock_lookup This routine scans the ipv6_fl_list whose update is protected with the socket lock and the ip6_sk_fl_lock. Since the socket lock is not taken in the lookup, use the other one. Signed-off-by: Pavel Emelyanov Signed-off-by: David S. Miller --- net/ipv6/ip6_flowlabel.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index 8550df20f984..f40a08669db0 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -190,14 +190,17 @@ struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) label &= IPV6_FLOWLABEL_MASK; + read_lock_bh(&ip6_sk_fl_lock); for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { struct ip6_flowlabel *fl = sfl->fl; if (fl->label == label) { + read_unlock_bh(&ip6_sk_fl_lock); fl->lastuse = jiffies; atomic_inc(&fl->users); return fl; } } + read_unlock_bh(&ip6_sk_fl_lock); return NULL; } -- 2.20.1