From: Joe Thornber ejt@redhat.com
stable inclusion from linux-4.19.191 commit 7cba7ebfd905cae6a50f548477a0e17ccd176ddf
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commit 5208692e80a1f3c8ce2063a22b675dd5589d1d80 upstream.
This division bug meant the search for free metadata space could skip the final allocation bitmap's worth of entries. Fix affects DM thinp, cache and era targets.
Cc: stable@vger.kernel.org Signed-off-by: Joe Thornber ejt@redhat.com Tested-by: Ming-Hung Tsai mtsai@redhat.com Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/md/persistent-data/dm-space-map-common.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c index 17aef55ed708a..a284762e548e1 100644 --- a/drivers/md/persistent-data/dm-space-map-common.c +++ b/drivers/md/persistent-data/dm-space-map-common.c @@ -337,6 +337,8 @@ int sm_ll_find_free_block(struct ll_disk *ll, dm_block_t begin, */ begin = do_div(index_begin, ll->entries_per_block); end = do_div(end, ll->entries_per_block); + if (end == 0) + end = ll->entries_per_block;
for (i = index_begin; i < index_end; i++, begin = 0) { struct dm_block *blk;