Patch "ovl: fix random return value on mount" has been added to the 4.9-stable tree

Patch "ovl: fix random return value on mount" has been added to the 4.9-stable tree

[gregkh]

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

    ovl: fix random return value on mount

to the 4.9-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:
     ovl-fix-random-return-value-on-mount.patch
and it can be found in the queue-4.9 subdirectory.

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


>From 8fc646b44385ff0a9853f6590497e43049eeb311 Mon Sep 17 00:00:00 2001
From: Amir Goldstein <amir73il@gmail.com>
Date: Tue, 11 Jul 2017 15:58:35 +0300
Subject: ovl: fix random return value on mount

From: Amir Goldstein <amir73il@gmail.com>

commit 8fc646b44385ff0a9853f6590497e43049eeb311 upstream.

On failure to prepare_creds(), mount fails with a random
return value, as err was last set to an integer cast of
a valid lower mnt pointer or set to 0 if inodes index feature
is enabled.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 3fe6e52f0626 ("ovl: override creds with the ones from ...")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/overlayfs/super.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1310,6 +1310,7 @@ static int ovl_fill_super(struct super_b
 	else
 		sb->s_d_op = &ovl_dentry_operations;
 
+	err = -ENOMEM;
 	ufs->creator_cred = cred = prepare_creds();
 	if (!cred)
 		goto out_put_lower_mnt;


Patches currently in stable-queue which might be from amir73il@gmail.com are

queue-4.9/ovl-drop-cap_sys_resource-from-saved-mounter-s-credentials.patch
queue-4.9/ovl-fix-random-return-value-on-mount.patch