From c1c534609fe8a859f9c8108a5591e6e8a97e34d1 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 10 Nov 2015 10:14:38 -0700 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- fs/direct-io.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index 7025029c666f..15381c474a11 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -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; -- 2.20.1