diff options
Diffstat (limited to 'drivers/md/dm-table.c')
| -rw-r--r-- | drivers/md/dm-table.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index e298d8d11f24..f3f952e347ed 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -189,8 +189,10 @@ static int alloc_targets(struct dm_table *t, unsigned int num) /* * Allocate both the target array and offset array at once. + * Append an empty entry to catch sectors beyond the end of + * the device. */ - n_highs = (sector_t *) dm_vcalloc(num, sizeof(struct dm_target) + + n_highs = (sector_t *) dm_vcalloc(num + 1, sizeof(struct dm_target) + sizeof(sector_t)); if (!n_highs) return -ENOMEM; @@ -867,6 +869,9 @@ struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index) /* * Search the btree for the correct target. + * + * Caller should check returned pointer with dm_target_is_valid() + * to trap I/O beyond end of device. */ struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector) { |