linux-fsdevel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Hannes Reinecke <hare@suse.de>
To: Jan Kara <jack@suse.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Hannes Reinecke <hare@suse.de>, Hannes Reinecke <hare@suse.com>
Subject: [PATCH] block_dev: fix crash on chained bios with O_DIRECT
Date: Wed, 20 Mar 2019 09:12:53 +0100	[thread overview]
Message-ID: <20190320081253.129688-1-hare@suse.de> (raw)

__blkdev_direct_IO_simple() is allocating a bio on the stack.
When that bio needs to be split bio_chain_endio() invokes bio_put()
on this bio, causing the kernel to crash in mempool_free() as the
bio was never allocated from a mempool in the first place.
So call bio_get() before submitting to avoid this problem.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
 fs/block_dev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index c546cdce77e6..4b3a04c3b8bd 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -235,6 +235,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
 	if (iocb->ki_flags & IOCB_HIPRI)
 		bio.bi_opf |= REQ_HIPRI;
 
+	bio_get(&bio);
 	qc = submit_bio(&bio);
 	for (;;) {
 		set_current_state(TASK_UNINTERRUPTIBLE);
@@ -254,7 +255,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
 
 	if (unlikely(bio.bi_status))
 		ret = blk_status_to_errno(bio.bi_status);
-
+	bio_put(&bio);
 out:
 	if (vecs != inline_vecs)
 		kfree(vecs);
-- 
2.16.4


             reply	other threads:[~2019-03-20  8:12 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20  8:12 Hannes Reinecke [this message]
2019-03-20  8:45 ` [PATCH] block_dev: fix crash on chained bios with O_DIRECT Johannes Thumshirn
2019-03-20  8:51   ` Hannes Reinecke
2019-03-20  8:53     ` Johannes Thumshirn
2019-03-20 11:47       ` Jan Kara
2019-03-20 13:19         ` Johannes Thumshirn
2019-03-20 19:57           ` Jens Axboe
2019-03-21  8:28             ` Johannes Thumshirn

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190320081253.129688-1-hare@suse.de \
    --to=hare@suse.de \
    --cc=axboe@kernel.dk \
    --cc=hare@suse.com \
    --cc=jack@suse.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).