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authorMikulas Patocka <mpatocka@redhat.com>2019-08-26 02:41:17 -0400
committerMike Snitzer <snitzer@redhat.com>2019-08-26 10:33:58 -0400
commit0c8e9c2d668278652af028c3cc068c65f66342f4 (patch)
tree36c71f19d38f2ff311420113082511924d4cf6fe /drivers/md
parent88cd3e6cfac915f50f7aa7b699bdf053afec866e (diff)
dm zoned: fix invalid memory access
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@vger.kernel.org Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-zoned-target.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index 31478fef6032..d3bcc4197f5d 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -134,8 +134,6 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
refcount_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;