This is a note to let you know that I've just added the patch titled netrom: Fix a data-race around sysctl_netrom_transport_requested_window_size 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_transpor.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 b547c43818854bf4fcc50a719f8b62ed54237ed8 Author: Jason Xing <kernelxing@xxxxxxxxxxx> Date: Mon Mar 4 16:20:42 2024 +0800 netrom: Fix a data-race around sysctl_netrom_transport_requested_window_size [ Upstream commit a2e706841488f474c06e9b33f71afc947fb3bf56 ] 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/af_netrom.c b/net/netrom/af_netrom.c index 5769fe9c111ed..1d4b4d228ca0b 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -465,7 +465,7 @@ static int nr_create(struct net *net, struct socket *sock, int protocol, msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_busy_delay)); nr->idle = msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout); - nr->window = sysctl_netrom_transport_requested_window_size; + nr->window = READ_ONCE(sysctl_netrom_transport_requested_window_size); nr->bpqext = 1; nr->state = NR_STATE_0;