The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Thanks,
Sasha
------------------ original commit in Linus's tree ------------------
>From 4d51419d49930be2701c2633ae271b350397c3ca Mon Sep 17 00:00:00 2001
From: Ilya Maximets <i.maximets@xxxxxxx>
Date: Sun, 4 Apr 2021 19:50:31 +0200
Subject: [PATCH] openvswitch: fix send of uninitialized stack memory in ct
limit reply
'struct ovs_zone_limit' has more members than initialized in
ovs_ct_limit_get_default_limit(). The rest of the memory is a random
kernel stack content that ends up being sent to userspace.
Fix that by using designated initializer that will clear all
non-specified fields.
Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit")
Signed-off-by: Ilya Maximets <i.maximets@xxxxxxx>
Acked-by: Tonghao Zhang <xiangxia.m.yue@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
net/openvswitch/conntrack.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 71cec03e8612..d217bd91176b 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -2034,10 +2034,10 @@ static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
struct sk_buff *reply)
{
- struct ovs_zone_limit zone_limit;
-
- zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE;
- zone_limit.limit = info->default_limit;
+ struct ovs_zone_limit zone_limit = {
+ .zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE,
+ .limit = info->default_limit,
+ };
return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
}
--
2.30.2
