From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 22 Nov 2011 17:31:21 +0000 (-0500)
Subject: mount_subtree() pointless use-after-free
X-Git-Tag: v3.2-rc3~10^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d31da0f0ba3bc0a827a63879310818c22d9a95be;p=pandora-kernel.git

mount_subtree() pointless use-after-free

d'oh... we'd carefully pinned mnt->mnt_sb down, dropped mnt and attempt
to grab s_umount on mnt->mnt_sb.  The trouble is, *mnt might've been
overwritten by now...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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