[PATCH 4.14 026/185] dm zoned: fix invalid memory access

From: Greg Kroah-Hartman
Date: Thu Oct 03 2019 - 13:34:03 EST


From: Mikulas Patocka <mpatocka@xxxxxxxxxx>

[ Upstream commit 0c8e9c2d668278652af028c3cc068c65f66342f4 ]

Commit 75d66ffb48efb30f2dd42f041ba8b39c5b2bd115 ("dm zoned: properly
handle backing device failure") triggers a coverity warning:

*** CID 1452808: Memory - illegal accesses (USE_AFTER_FREE)
/drivers/md/dm-zoned-target.c: 137 in dmz_submit_bio()
131 clone->bi_private = bioctx;
132
133 bio_advance(bio, clone->bi_iter.bi_size);
134
135 refcount_inc(&bioctx->ref);
136 generic_make_request(clone);
>>> CID 1452808: Memory - illegal accesses (USE_AFTER_FREE)
>>> Dereferencing freed pointer "clone".
137 if (clone->bi_status == BLK_STS_IOERR)
138 return -EIO;
139
140 if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone))
141 zone->wp_block += nr_blocks;
142

The "clone" bio may be processed and freed before the check
"clone->bi_status == BLK_STS_IOERR" - so this check can access invalid
memory.

Fixes: 75d66ffb48efb3 ("dm zoned: properly handle backing device failure")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/md/dm-zoned-target.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 1e004d975e786..4694763f9d404 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -133,8 +133,6 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,

atomic_inc(&bioctx->ref);
generic_make_request(clone);
- if (clone->bi_status == BLK_STS_IOERR)
- return -EIO;

if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone))
zone->wp_block += nr_blocks;
--
2.20.1