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To: stable@vger.kernel.org
From: Greg Hackmann <ghackmann@google.com>
Subject: Please apply "ext4: verify the depth of extent tree in
 ext4_find_extent()" to 3.18.y
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Date: Wed, 26 Sep 2018 14:00:19 -0700
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bc890a602471 ("ext4: verify the depth of extent tree in 
ext4_find_extent()") fixes a potential buffer overrun when mounting 
corrupted ext4 filesystems.

It was taken into 4.4.y and later but not 3.18.y, probably because it 
doesn't build as-is against 3.18.  Ben Hutchings has a backport in the 
latest 3.16.y release (09999807edd8) which would work for 3.18.y too.