This is a note to let you know that I've just added the patch titled cifs: Do not use the original cruid when following DFS links for multiuser mounts to the 5.12-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-do-not-use-the-original-cruid-when-following-dfs-links-for-multiuser-mounts.patch and it can be found in the queue-5.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 50630b3f1ada0bf412d3f28e73bac310448d9d6f Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> Date: Tue, 13 Jul 2021 12:22:59 +1000 Subject: cifs: Do not use the original cruid when following DFS links for multiuser mounts From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> commit 50630b3f1ada0bf412d3f28e73bac310448d9d6f upstream. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=213565 cruid should only be used for the initial mount and after this we should use the current users credentials. Ignore the original cruid mount argument when creating a new context for a multiuser mount following a DFS link. Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api") Cc: stable@xxxxxxxxxxxxxxx # 5.11+ Reported-by: Xiaoli Feng <xifeng@xxxxxxxxxx> Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/cifs_dfs_ref.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/cifs/cifs_dfs_ref.c +++ b/fs/cifs/cifs_dfs_ref.c @@ -208,6 +208,10 @@ char *cifs_compose_mount_options(const c else noff = tkn_e - (sb_mountdata + off) + 1; + if (strncasecmp(sb_mountdata + off, "cruid=", 6) == 0) { + off += noff; + continue; + } if (strncasecmp(sb_mountdata + off, "unc=", 4) == 0) { off += noff; continue; Patches currently in stable-queue which might be from lsahlber@xxxxxxxxxx are queue-5.12/cifs-do-not-use-the-original-cruid-when-following-dfs-links-for-multiuser-mounts.patch