This is a note to let you know that I've just added the patch titled
ip: Fix a data-race around sysctl_fwmark_reflect.
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:
ip-fix-a-data-race-around-sysctl_fwmark_reflect.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 e069be3ccde4d0e9f3592d4cab9efd0a765d2452
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date: Wed Jul 13 13:51:57 2022 -0700
ip: Fix a data-race around sysctl_fwmark_reflect.
[ Upstream commit 85d0b4dbd74b95cc492b1f4e34497d3f894f5d9a ]
While reading sysctl_fwmark_reflect, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its reader.
Fixes: e110861f8609 ("net: add a sysctl to reflect the fwmark on replies")
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/include/net/ip.h b/include/net/ip.h
index 05fe313f72fa..4a15b6bcb4b8 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -384,7 +384,7 @@ void ipfrag_init(void);
void ip_static_sysctl_init(void);
#define IP4_REPLY_MARK(net, mark) \
- ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
+ (READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0)
static inline bool ip_is_fragment(const struct iphdr *iph)
{
