This is a note to let you know that I've just added the patch titled
icmp: Fix a data-race around sysctl_icmp_errors_use_inbound_ifaddr.
to the 5.18-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:
icmp-fix-a-data-race-around-sysctl_icmp_errors_use_i.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 110949f8e518eb3f08167dbf345a6bfbd79514d2
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date: Mon Jul 11 17:15:26 2022 -0700
icmp: Fix a data-race around sysctl_icmp_errors_use_inbound_ifaddr.
[ Upstream commit d2efabce81db7eed1c98fa1a3f203f0edd738ac3 ]
While reading sysctl_icmp_errors_use_inbound_ifaddr, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 1c2fb7f93cb2 ("[IPV4]: Sysctl configurable icmp error source address.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 1a061d10949f..37ba5f042908 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -693,7 +693,7 @@ void __icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info,
rcu_read_lock();
if (rt_is_input_route(rt) &&
- net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
+ READ_ONCE(net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr))
dev = dev_get_by_index_rcu(net, inet_iif(skb_in));
if (dev)
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 4cf2a6f560d4..33e65e79e46e 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -639,6 +639,8 @@ static struct ctl_table ipv4_net_table[] = {
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE
},
{
.procname = "icmp_ratelimit",
