This is a note to let you know that I've just added the patch titled
devlink: protect devlink dump by the instance lock
to the 6.0-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:
devlink-protect-devlink-dump-by-the-instance-lock.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f2847aa712f0534fb0dd6b944bb3cf1097500f33
Author: Jakub Kicinski <kuba@xxxxxxxxxx>
Date: Thu Dec 15 20:41:22 2022 -0800
devlink: protect devlink dump by the instance lock
[ Upstream commit 214964a13ab56a9757d146b79b468a7ca190fbfb ]
Take the instance lock around devlink_nl_fill() when dumping,
doit takes it already.
We are only dumping basic info so in the worst case we were risking
data races around the reload statistics. Until the big devlink mutex
was removed all relevant code was protected by it, so the missing
instance lock was not exposed.
Fixes: d3efc2a6a6d8 ("net: devlink: remove devlink_mutex")
Reviewed-by: Jiri Pirko <jiri@xxxxxxxxxx>
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221216044122.1863550-1-kuba@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/devlink.c b/net/core/devlink.c
index b3a869ccc8ed..5f894bd20c31 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -1498,10 +1498,13 @@ static int devlink_nl_cmd_get_dumpit(struct sk_buff *msg,
continue;
}
+ devl_lock(devlink);
err = devlink_nl_fill(msg, devlink, DEVLINK_CMD_NEW,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI);
+ devl_unlock(devlink);
devlink_put(devlink);
+
if (err)
goto out;
idx++;
