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authorEric Dumazet <edumazet@google.com>2018-02-12 08:11:48 -0800
committerPablo Neira Ayuso <pablo@netfilter.org>2018-02-16 15:00:55 +0100
commitde526f401284e1638d4c97cb5a4c292ac3f37655 (patch)
treeadce3258de97f6e996bc6abddcb70f961db5bba8 /net
parentdb57ccf0f2f4624b4c4758379f8165277504fbd7 (diff)
downloadlinux-de526f401284e1638d4c97cb5a4c292ac3f37655.tar.bz2
netfilter: xt_hashlimit: fix lock imbalance
syszkaller found that rcu was not held in hashlimit_mt_common() We only need to enable BH at this point. Fixes: bea74641e378 ("netfilter: xt_hashlimit: add rate match mode") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzkaller <syzkaller@googlegroups.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/xt_hashlimit.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index aa96027f4418..66f5aca62a08 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -775,7 +775,7 @@ hashlimit_mt_common(const struct sk_buff *skb, struct xt_action_param *par,
if (!dh->rateinfo.prev_window &&
(dh->rateinfo.current_rate <= dh->rateinfo.burst)) {
spin_unlock(&dh->lock);
- rcu_read_unlock_bh();
+ local_bh_enable();
return !(cfg->mode & XT_HASHLIMIT_INVERT);
} else {
goto overlimit;