Patch "netrom: Fix a data-race around sysctl_netrom_link_fails_count" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    netrom: Fix a data-race around sysctl_netrom_link_fails_count

to the 5.10-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:
     netrom-fix-a-data-race-around-sysctl_netrom_link_fai.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3ab31fad4f782da68f591f418d93dc58bec13a70
Author: Jason Xing <kernelxing@xxxxxxxxxxx>
Date:   Mon Mar 4 16:20:45 2024 +0800

    netrom: Fix a data-race around sysctl_netrom_link_fails_count
    
    [ Upstream commit bc76645ebdd01be9b9994dac39685a3d0f6f7985 ]
    
    We need to protect the reader reading the sysctl value because the
    value can be changed concurrently.
    
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 88c59bd0f7397..895702337c92e 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -725,7 +725,7 @@ void nr_link_failed(ax25_cb *ax25, int reason)
 	nr_neigh->ax25 = NULL;
 	ax25_cb_put(ax25);
 
-	if (++nr_neigh->failed < sysctl_netrom_link_fails_count) {
+	if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) {
 		nr_neigh_put(nr_neigh);
 		return;
 	}




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