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direct-io: be sure to assign dio->bio_bdev for both paths 

btrfs sets ->submit_io(), and we failed to set the block dev for
that path. That resulted in a potential NULL dereference when
we later wait for IO in dio_await_one().

Reported-by: kernel test robot <ying.huang@linux.intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2015-11-10 10:14:38 -07:00
parent 15c4f638f3
commit c1c534609f
1 changed files with 3 additions and 3 deletions
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6
fs/direct-io.c
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@ -399,14 +399,14 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio)
if (dio->is_async && dio->rw == READ && dio->should_dirty)
bio_set_pages_dirty(bio);
dio->bio_bdev = bio->bi_bdev;
if (sdio->submit_io) {
sdio->submit_io(dio->rw, bio, dio->inode,
sdio->logical_offset_in_bio);
dio->bio_cookie = BLK_QC_T_NONE;
} else {
} else
dio->bio_cookie = submit_bio(dio->rw, bio);
dio->bio_bdev = bio->bi_bdev;
}
sdio->bio = NULL;
sdio->boundary = 0;