commit 553a1f6d027a8e0c59ca7bbe0f26a25d1881cfef
author Theodore Ts'o <tytso@mit.edu> Mon Aug 01 00:51:02 2016 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> Sun Sep 11 09:59:58 2016 +0200
tree daf9444d19a5cc1b519c1fc1c8746ff9fa9c0521
parent a6e226c25157082a043cce63d14ecab68fdcc433

ext4: validate that metadata blocks do not overlap superblock

commit 829fa70dddadf9dd041d62b82cd7cea63943899d upstream.

A number of fuzzing failures seem to be caused by allocation bitmaps
or other metadata blocks being pointed at the superblock.

This can cause kernel BUG or WARNings once the superblock is
overwritten, so validate the group descriptor blocks to make sure this
doesn't happen.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>