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| author | Mikulas Patocka <mpatocka@redhat.com> | 2019-08-26 02:41:17 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-01 09:01:42 +0200 |
| commit | 8defaa56897e201426af10265d3edb4969b66bba (patch) | |
| tree | 379b94f2f5b2fb9a995d7bfe17d9b181037f7d00 /drivers/md | |
| parent | bca9bfa41e3fffcf4ef5fb196e5ee2d4749c01e3 (diff) | |
| download | linux-stable-8defaa56897e201426af10265d3edb4969b66bba.tar.gz linux-stable-8defaa56897e201426af10265d3edb4969b66bba.tar.bz2 linux-stable-8defaa56897e201426af10265d3edb4969b66bba.zip | |
dm zoned: fix invalid memory access
[ 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@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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-zoned-target.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c index ff3fd011796e..3334f5865de7 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, 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; |