diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2013-11-22 19:52:06 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-20 07:49:04 -0800 |
| commit | ce73a302c1afca60e23b176a87edfdfaa3485f61 (patch) | |
| tree | 9906114fc6b2febd670ac59c778d6f0edae5a574 /drivers/md | |
| parent | cb4d254628bb8f74d9034eb701600555939c6143 (diff) | |
dm table: fail dm_table_create on dm_round_up overflow
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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 41d907b58f7..20a8cc0df7c 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -200,6 +200,11 @@ 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; |