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path: root/net/ipv6/ip6_flowlabel.c
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Diffstat (limited to 'net/ipv6/ip6_flowlabel.c')
-rw-r--r--net/ipv6/ip6_flowlabel.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index be5f3d7ceb96..f994f50e1516 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -254,9 +254,9 @@ struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
rcu_read_lock_bh();
for_each_sk_fl_rcu(np, sfl) {
struct ip6_flowlabel *fl = sfl->fl;
- if (fl->label == label) {
+
+ if (fl->label == label && atomic_inc_not_zero(&fl->users)) {
fl->lastuse = jiffies;
- atomic_inc(&fl->users);
rcu_read_unlock_bh();
return fl;
}
@@ -622,7 +622,8 @@ int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
goto done;
}
fl1 = sfl->fl;
- atomic_inc(&fl1->users);
+ if (!atomic_inc_not_zero(&fl1->users))
+ fl1 = NULL;
break;
}
}