This is a note to let you know that I've just added the patch titled
net: Fix a data-race around netdev_unregister_timeout_secs.
to the 5.19-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:
net-fix-a-data-race-around-netdev_unregister_timeout.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7314582bacebe01e1505eda0347669f88e897f18
Author: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Date: Tue Aug 23 10:46:59 2022 -0700
net: Fix a data-race around netdev_unregister_timeout_secs.
[ Upstream commit 05e49cfc89e4f325eebbc62d24dd122e55f94c23 ]
While reading netdev_unregister_timeout_secs, it can be changed
concurrently. Thus, we need to add READ_ONCE() to its reader.
Fixes: 5aa3afe107d9 ("net: make unregister netdev warning timeout configurable")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Acked-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/dev.c b/net/core/dev.c
index 19baeaf65a646..a77a979a4bf75 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10265,7 +10265,7 @@ static struct net_device *netdev_wait_allrefs_any(struct list_head *list)
return dev;
if (time_after(jiffies, warning_time +
- netdev_unregister_timeout_secs * HZ)) {
+ READ_ONCE(netdev_unregister_timeout_secs) * HZ)) {
list_for_each_entry(dev, list, todo_list) {
pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
dev->name, netdev_refcnt_read(dev));
