| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 087/118] dm table: fail dm_table_create on dm_round_up overflow | Date | Wed, 18 Dec 2013 13:12:04 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Mikulas Patocka <mpatocka@redhat.com>
commit 5b2d06576c5410c10d95adfd5c4d8b24de861d87 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/md/dm-table.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -200,6 +200,11 @@ int dm_table_create(struct dm_table **re num_targets = dm_round_up(num_targets, KEYS_PER_NODE); + if (!num_targets) { + kfree(t); + return -ENOMEM; + } + if (alloc_targets(t, num_targets)) { kfree(t); return -ENOMEM;
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