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| author | Yang Yingliang <yangyingliang@huawei.com> | 2019-12-18 16:44:04 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-12 12:12:00 +0100 |
| commit | 62dfe5f55d2ca0b350fa76333fbb8a57b31c864a (patch) | |
| tree | a2c4c18591d014517c1f372a23f960c789416760 | |
| parent | 66aa3bf42c2c009a14c3cf0214b95a32c11abc9e (diff) | |
| download | linux-stable-62dfe5f55d2ca0b350fa76333fbb8a57b31c864a.tar.gz linux-stable-62dfe5f55d2ca0b350fa76333fbb8a57b31c864a.tar.bz2 linux-stable-62dfe5f55d2ca0b350fa76333fbb8a57b31c864a.zip | |
block: fix memleak when __blk_rq_map_user_iov() is failed
[ Upstream commit 3b7995a98ad76da5597b488fa84aa5a56d43b608 ]
When I doing fuzzy test, get the memleak report:
BUG: memory leak
unreferenced object 0xffff88837af80000 (size 4096):
comm "memleak", pid 3557, jiffies 4294817681 (age 112.499s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
20 00 00 00 10 01 00 00 00 00 00 00 01 00 00 00 ...............
backtrace:
[<000000001c894df8>] bio_alloc_bioset+0x393/0x590
[<000000008b139a3c>] bio_copy_user_iov+0x300/0xcd0
[<00000000a998bd8c>] blk_rq_map_user_iov+0x2f1/0x5f0
[<000000005ceb7f05>] blk_rq_map_user+0xf2/0x160
[<000000006454da92>] sg_common_write.isra.21+0x1094/0x1870
[<00000000064bb208>] sg_write.part.25+0x5d9/0x950
[<000000004fc670f6>] sg_write+0x5f/0x8c
[<00000000b0d05c7b>] __vfs_write+0x7c/0x100
[<000000008e177714>] vfs_write+0x1c3/0x500
[<0000000087d23f34>] ksys_write+0xf9/0x200
[<000000002c8dbc9d>] do_syscall_64+0x9f/0x4f0
[<00000000678d8e9a>] entry_SYSCALL_64_after_hwframe+0x49/0xbe
If __blk_rq_map_user_iov() is failed in blk_rq_map_user_iov(),
the bio(s) which is allocated before this failing will leak. The
refcount of the bio(s) is init to 1 and increased to 2 by calling
bio_get(), but __blk_rq_unmap_user() only decrease it to 1, so
the bio cannot be freed. Fix it by calling blk_rq_unmap_user().
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | block/blk-map.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-map.c b/block/blk-map.c index e31be14da8ea..f72a3af689b6 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -152,7 +152,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, return 0; unmap_rq: - __blk_rq_unmap_user(bio); + blk_rq_unmap_user(bio); fail: rq->bio = NULL; return ret; |