From: hujianyang <hujianyang@huawei.com>
Date: Tue, 6 Jan 2015 04:52:13 +0000 (+0800)
Subject: ovl: Fix kernel panic while mounting overlayfs
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~3^2~17^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f83fd8c2849a388082f30d755a75c1e67c4643b;p=pandora-kernel.git

ovl: Fix kernel panic while mounting overlayfs

The function ovl_fill_super() in recently multi-layer support
version will incorrectly return 0 at error handling path and
then cause kernel panic.

This failure can be reproduced by mounting a overlayfs with
upperdir and workdir in different mounts.

And also, If the memory allocation of *lower_mnt* fail, this
function may return an zero either.

This patch fix this problem by setting *err* to proper error
number before jumping to error handling path.

Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
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