From: Mikulas Patocka <mpatocka@redhat.com>
Date: Sat, 23 Nov 2013 00:52:06 +0000 (-0500)
Subject: dm table: fail dm_table_create on dm_round_up overflow
X-Git-Tag: v3.13-rc4~11^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b2d06576c5410c10d95adfd5c4d8b24de861d87;p=pandora-kernel.git

dm table: fail dm_table_create on dm_round_up overflow

The dm_round_up function may overflow to zero.  In this case,
dm_table_create() must fail rather than go on to allocate an empty array
with alloc_targets().

This fixes a possible memory corruption that could be caused by passing
too large a number in "param->target_count".

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
---

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