This is a note to let you know that I've just added the patch titled
cifs: protect updating server->dstaddr with a spinlock
to the 4.4-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:
cifs-protect-updating-server-dstaddr-with-a-spinlock.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ff0cd55c4b032b8653d8c7ccb0a509f312db31ff
Author: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Date: Tue Apr 21 12:37:39 2020 +1000
cifs: protect updating server->dstaddr with a spinlock
[ Upstream commit fada37f6f62995cc449b36ebba1220594bfe55fe ]
We use a spinlock while we are reading and accessing the destination address for a server.
We need to also use this spinlock to protect when we are modifying this address from
reconn_set_ipaddr().
Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cf104bbe30a14..c9793ce0d3368 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -338,8 +338,10 @@ static int reconn_set_ipaddr(struct TCP_Server_Info *server)
return rc;
}
+ spin_lock(&cifs_tcp_ses_lock);
rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
strlen(ipaddr));
+ spin_unlock(&cifs_tcp_ses_lock);
kfree(ipaddr);
return !rc ? -1 : 0;
