This is a note to let you know that I've just added the patch titled
netrom: Fix a data-race around sysctl_netrom_default_path_quality
to the 4.19-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:
netrom-fix-a-data-race-around-sysctl_netrom_default_.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a623b79ddbbda55c083ac3bd192893f027a271a7
Author: Jason Xing <kernelxing@xxxxxxxxxxx>
Date: Mon Mar 4 16:20:35 2024 +0800
netrom: Fix a data-race around sysctl_netrom_default_path_quality
[ Upstream commit 958d6145a6d9ba9e075c921aead8753fb91c9101 ]
We need to protect the reader reading sysctl_netrom_default_path_quality
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 53ced34a1fdd2..e3ce3531608c4 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -156,7 +156,7 @@ static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
nr_neigh->digipeat = NULL;
nr_neigh->ax25 = NULL;
nr_neigh->dev = dev;
- nr_neigh->quality = sysctl_netrom_default_path_quality;
+ nr_neigh->quality = READ_ONCE(sysctl_netrom_default_path_quality);
nr_neigh->locked = 0;
nr_neigh->count = 0;
nr_neigh->number = nr_neigh_no++;
