Patch "netfilter: ipset: use nfnl_mutex_is_locked" is added the real
mutex locking check, which revealed the missing locking in ip_set_net_exit().
Signed-off-by: Jozsef Kadlecsik <kadlec@xxxxxxxxxxxxxxxxx>
Reported-by: syzbot+36b06f219f2439fe62e1@xxxxxxxxxxxxxxxxxxxxxxxxx
---
net/netfilter/ipset/ip_set_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index e002990..728bf31 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -2078,6 +2078,7 @@ ip_set_net_exit(struct net *net)
inst->is_deleted = true; /* flag for ip_set_nfnl_put */
+ nfnl_lock(NFNL_SUBSYS_IPSET);
for (i = 0; i < inst->ip_set_max; i++) {
set = ip_set(inst, i);
if (set) {
@@ -2085,6 +2086,7 @@ ip_set_net_exit(struct net *net)
ip_set_destroy_set(set);
}
}
+ nfnl_unlock(NFNL_SUBSYS_IPSET);
kfree(rcu_dereference_protected(inst->ip_set_list, 1));
}
--
2.1.4
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