This is a note to let you know that I've just added the patch titled
netfilter: xt_cgroup: initialize info->priv in cgroup_mt_check_v1()
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-xt_cgroup-initialize-info-priv-in-cgroup_mt_check_v1.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ba7cd5d95f25cc6005f687dabdb4e7a6063adda9 Mon Sep 17 00:00:00 2001
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Date: Wed, 31 Jan 2018 15:02:47 -0800
Subject: netfilter: xt_cgroup: initialize info->priv in cgroup_mt_check_v1()
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
commit ba7cd5d95f25cc6005f687dabdb4e7a6063adda9 upstream.
xt_cgroup_info_v1->priv is an internal pointer only used for kernel,
we should not trust what user-space provides.
Reported-by: <syzbot+4fbcfcc0d2e6592bd641@xxxxxxxxxxxxxxxxxxxxxxxxx>
Fixes: c38c4597e4bf ("netfilter: implement xt_cgroup cgroup2 path match")
Cc: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/netfilter/xt_cgroup.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/netfilter/xt_cgroup.c
+++ b/net/netfilter/xt_cgroup.c
@@ -52,6 +52,7 @@ static int cgroup_mt_check_v1(const stru
return -EINVAL;
}
+ info->priv = NULL;
if (info->has_path) {
cgrp = cgroup_get_from_path(info->path);
if (IS_ERR(cgrp)) {
Patches currently in stable-queue which might be from xiyou.wangcong@xxxxxxxxx are
queue-4.15/net_sched-gen_estimator-fix-lockdep-splat.patch
queue-4.15/netfilter-xt_cgroup-initialize-info-priv-in-cgroup_mt_check_v1.patch
queue-4.15/netfilter-xt_rateest-acquire-xt_rateest_mutex-for-hash-insert.patch