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dm table: fail dm_table_create on dm_round_up overflow

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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>
This commit is contained in:
Mikulas Patocka
2013-11-22 19:52:06 -05:00
committed by Greg Kroah-Hartman
parent 2c54d62aa8
commit 135949c10b
1 changed files with 5 additions and 0 deletions
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drivers/md/dm-table.c
+5
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@@ -215,6 +215,11 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
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;