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| author | Mikulas Patocka <mpatocka@redhat.com> | 2013-11-23 01:52:06 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-12-10 22:34:27 +0100 |
| commit | 5b2d06576c5410c10d95adfd5c4d8b24de861d87 (patch) | |
| tree | 252b895b66b63a84a166af0142472cdf3a1c3640 /drivers/md | |
| parent | dm snapshot: avoid snapshot space leak on crash (diff) | |
| download | linux-5b2d06576c5410c10d95adfd5c4d8b24de861d87.tar.xz linux-5b2d06576c5410c10d95adfd5c4d8b24de861d87.zip | |
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
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 465f08ca62b1..3ba6a3859ce3 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; |