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dm cache metadata: ignore hints array being too small during resize 

commit 4561ffca88 upstream.

Commit fd2fa9541 ("dm cache metadata: save in-core policy_hint_size to
on-disk superblock") enabled previously written policy hints to be
used after a cache is reactivated.  But in doing so the cache
metadata's hint array was left exposed to out of bounds access because
on resize the metadata's on-disk hint array wasn't ever extended.

Fix this by ignoring that there are no on-disk hints associated with the
newly added cache blocks.  An expanded on-disk hint array is later
rewritten upon the next clean shutdown of the cache.

Fixes: fd2fa9541 ("dm cache metadata: save in-core policy_hint_size to on-disk superblock")
Cc: stable@vger.kernel.org
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Joe Thornber 2018-09-24 16:19:30 -04:00 committed by Greg Kroah-Hartman
parent 1364055c96
commit f11a6abfdb
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-cache-metadata.c
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@ -1454,8 +1454,8 @@ static int __load_mappings(struct dm_cache_metadata *cmd,
if (hints_valid) {
r = dm_array_cursor_next(&cmd->hint_cursor);
if (r) {
DMERR("dm_array_cursor_next for hint failed");
goto out;
dm_array_cursor_end(&cmd->hint_cursor);
hints_valid = false;
}
}