From e0702d90b79d430b0ccc276ead4f88440bb51352 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 19 Aug 2019 12:58:14 +0300 Subject: [PATCH] dm zoned: fix potential NULL dereference in dmz_do_reclaim() This function is supposed to return error pointers so it matches the dmz_get_rnd_zone_for_reclaim() function. The current code could lead to a NULL dereference in dmz_do_reclaim() Fixes: b234c6d7a703 ("dm zoned: improve error handling in reclaim") Signed-off-by: Dan Carpenter Reviewed-by: Dmitry Fomichev Signed-off-by: Mike Snitzer --- drivers/md/dm-zoned-metadata.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c index 2a5bc51fd6d5..595a73110e17 100644 --- a/drivers/md/dm-zoned-metadata.c +++ b/drivers/md/dm-zoned-metadata.c @@ -1588,7 +1588,7 @@ static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) struct dm_zone *zone; if (list_empty(&zmd->map_seq_list)) - return NULL; + return ERR_PTR(-EBUSY); list_for_each_entry(zone, &zmd->map_seq_list, link) { if (!zone->bzone) @@ -1597,7 +1597,7 @@ static struct dm_zone *dmz_get_seq_zone_for_reclaim(struct dmz_metadata *zmd) return zone; } - return NULL; + return ERR_PTR(-EBUSY); } /*