All of lore.kernel.org
 help / color / mirror / Atom feed
From: Yangxi Xiang <xyangxi5@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: gregkh@linuxfoundation.org,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Yangxi Xiang <xyangxi5@gmail.com>
Subject: [PATCH] devtmpfs: fix the dangling pointer of global devtmpfsd thread
Date: Mon, 27 Jun 2022 20:04:09 +0800	[thread overview]
Message-ID: <20220627120409.11174-1-xyangxi5@gmail.com> (raw)

When the devtmpfs fails to mount, a dangling pointer still remains in
global. Specifically, the err variable is passed by a pointer to the
devtmpfsd. When the devtmpfsd exits, it sets the error and completes the
setup_done. In this situation, the thread pointer is not set to null.
After the devtmpfsd exited, the devtmpfs can wakes up the destroyed
devtmpfsd thread by wake_up_process if a device change event comes.

Signed-off-by: Yangxi Xiang <xyangxi5@gmail.com>
---
 drivers/base/devtmpfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 8a3ddbae3b70..e4bffeabf344 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -482,6 +482,7 @@ int __init devtmpfs_init(void)
 	if (err) {
 		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
 		unregister_filesystem(&dev_fs_type);
+		thread = NULL;
 		return err;
 	}
 
-- 
2.17.1


                 reply	other threads:[~2022-06-27 12:08 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=20220627120409.11174-1-xyangxi5@gmail.com \
    --to=xyangxi5@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=rafael@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.