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dm space map common: fix division bug in sm_ll_find_free_block()

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commit 5208692e80 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>
This commit is contained in:
Joe Thornber 2021-04-13 09:11:53 +01:00 • committed by Greg Kroah-Hartman
commit df893916b3
1 changed files with 2 additions and 0 deletions
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2
drivers/md/persistent-data/dm-space-map-common.c
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@ -339,6 +339,8 @@ 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;