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block: missing bio_put following submit_bio_wait 

submit_bio_wait() gives the caller an opportunity to examine
struct bio and so expects the caller to issue the put_bio()

This fixes a memory leak reported by a few people in 4.7-rc2
kmemleak report after 9082e87bfb ("block: remove struct bio_batch")

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Larry Finger@lwfinger.net
Tested-by: David Drysdale <drysdale@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Shaun Tancheff 2016-06-07 11:32:13 -05:00 committed by Jens Axboe
parent 87c279e613
commit 05bd92dddc
1 changed files with 9 additions and 3 deletions
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12
block/blk-lib.c
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@ -113,6 +113,7 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
ret = submit_bio_wait(type, bio);
if (ret == -EOPNOTSUPP)
ret = 0;
bio_put(bio);
}
blk_finish_plug(&plug);
@ -165,8 +166,10 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
}
}
if (bio)
if (bio) {
ret = submit_bio_wait(REQ_WRITE | REQ_WRITE_SAME, bio);
bio_put(bio);
}
return ret != -EOPNOTSUPP ? ret : 0;
}
EXPORT_SYMBOL(blkdev_issue_write_same);
@ -206,8 +209,11 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
}
}
if (bio)
return submit_bio_wait(WRITE, bio);
if (bio) {
ret = submit_bio_wait(WRITE, bio);
bio_put(bio);
return ret;
}
return 0;
}