From: Ming Lei <tom.leiming@gmail.com>
To: Jens Axboe <axboe@kernel.dk>, linux-kernel@vger.kernel.org
Cc: Christoph Hellwig <hch@lst.de>, Ming Lei <tom.leiming@gmail.com>
Subject: [PATCH] block: null_blk: fix use after free
Date: Thu, 1 May 2014 15:12:36 +0800 [thread overview]
Message-ID: <1398928356-24390-1-git-send-email-tom.leiming@gmail.com> (raw)
entry(cmd->ll_list) may belong to new request once end_cmd()
returns, so fix the bug with the patch.
Without the change, it is easy to observe oops when
doing null_blk(timer) test.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
drivers/block/null_blk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index 8e7e3a0..e932398 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -203,8 +203,8 @@ static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)
entry = llist_reverse_order(entry);
do {
cmd = container_of(entry, struct nullb_cmd, ll_list);
- end_cmd(cmd);
entry = entry->next;
+ end_cmd(cmd);
} while (entry);
}
--
1.7.9.5
next reply other threads:[~2014-05-01 7:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 7:12 Ming Lei [this message]
2014-05-01 15:17 ` [PATCH] block: null_blk: fix use after free Jens Axboe
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=1398928356-24390-1-git-send-email-tom.leiming@gmail.com \
--to=tom.leiming@gmail.com \
--cc=axboe@kernel.dk \
--cc=hch@lst.de \
--cc=linux-kernel@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