diff options
author | Jan Kara <jack@suse.cz> | 2017-03-02 18:50:13 +0300 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2017-03-02 18:56:59 +0300 |
commit | a5a79d00017c9eee68a9bcb40d5dfd6f45f17461 (patch) | |
tree | dc1803bee107865dbea5c4434bad158a15a66ced /block | |
parent | e02898b423802b1f3a3aaa7f16e896da069ba8f7 (diff) | |
download | linux-a5a79d00017c9eee68a9bcb40d5dfd6f45f17461.tar.xz |
block: Initialize bd_bdi on inode initialization
So far we initialized bd_bdi only in bdget(). That is fine for normal
bdev inodes however for the special case of the root inode of
blockdev_superblock that function is never called and thus bd_bdi is
left uninitialized. As a result bdev_evict_inode() may oops doing
bdi_put(root->bd_bdi) on that inode as can be seen when doing:
mount -t bdev none /mnt
Fix the problem by initializing bd_bdi when first allocating the inode
and then reinitializing bd_bdi in bdev_evict_inode().
Thanks to syzkaller team for finding the problem.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: b1d2dc5659b4 ("block: Make blk_get_backing_dev_info() safe without open bdev")
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions