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

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[ 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>
This commit is contained in:
Joe Thornber 2021-12-10 13:49:53 +00:00 committed by Greg Kroah-Hartman
parent 5850bef8e9
commit eaf8cffcf5
1 changed files with 5 additions and 0 deletions
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drivers/md/persistent-data/dm-space-map-common.c
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@ -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)