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netfilter: ipset: Fix rename concurrency with listing

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[ Upstream commit 6c1f7e2c1b ]

Shijie Luo reported that when stress-testing ipset with multiple concurrent
create, rename, flush, list, destroy commands, it can result

ipset <version>: Broken LIST kernel message: missing DATA part!

error messages and broken list results. The problem was the rename operation
was not properly handled with respect of listing. The patch fixes the issue.

Reported-by: Shijie Luo <luoshijie1@huawei.com>
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jozsef Kadlecsik 2019-07-23 10:25:55 +02:00 committed by Greg Kroah-Hartman
parent ea08214d8c
commit 63dd147e7a
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/ipset/ip_set_core.c
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@ -1157,7 +1157,7 @@ static int ip_set_rename(struct net *net, struct sock *ctnl,
return -ENOENT;
write_lock_bh(&ip_set_ref_lock);
if (set->ref != 0) {
if (set->ref != 0 || set->ref_netlink != 0) {
ret = -IPSET_ERR_REFERENCED;
goto out;
}