Commit b3fbe756 authored Dec 10, 2021 by Joe Thornber Committed by Greg Kroah-Hartman Jan 27, 2022

dm space map common: add bounds check to sm_ll_lookup_bitmap()



[ Upstream commit cba23ac158db7f3cd48a923d6861bee2eb7a2978 ]

Corrupted metadata could warrant returning error from sm_ll_lookup_bitmap().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 052f6401

drivers/md/persistent-data/dm-space-map-common.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -281,6 +281,11 @@ int sm_ll_lookup_bitmap(struct ll_disk ll, dm_block_t b, uint32_t result)
		struct disk_index_entry ie_disk;
		struct dm_block *blk;

		if (b >= ll->nr_blocks) {
		DMERR_LIMIT("metadata block out of bounds");
		return -EINVAL;
		}

		b = do_div(index, ll->entries_per_block);
		r = ll->load_ie(ll, index, &ie_disk);
		if (r < 0)