From: Martin Schiller <ms@dev.tdt.de>
To: andrew.hendry@gmail.com, davem@davemloft.net, kuba@kernel.org,
edumazet@google.com, xiyuyang19@fudan.edu.cn
Cc: linux-x25@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Martin Schiller <ms@dev.tdt.de>
Subject: [PATCH] net/x25: Fix null-ptr-deref in x25_connect
Date: Mon, 28 Sep 2020 11:23:27 +0200 [thread overview]
Message-ID: <20200928092327.329-1-ms@dev.tdt.de> (raw)
This fixes a regression for blocking connects introduced by commit
4becb7ee5b3d ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect").
The x25->neighbour is already set to "NULL" by x25_disconnect() now,
while a blocking connect is waiting in
x25_wait_for_connection_establishment(). Therefore x25->neighbour must
not be accessed here again and x25->state is also already set to
X25_STATE_0 by x25_disconnect().
Fixes: 4becb7ee5b3d ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect")
Signed-off-by: Martin Schiller <ms@dev.tdt.de>
---
net/x25/af_x25.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 0bbb283f23c9..0524a5530b91 100644
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -820,7 +820,7 @@ static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
rc = x25_wait_for_connection_establishment(sk);
if (rc)
- goto out_put_neigh;
+ goto out;
sock->state = SS_CONNECTED;
rc = 0;
--
2.20.1
next reply other threads:[~2020-09-28 9:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 9:23 Martin Schiller [this message]
2020-09-29 1:43 ` [PATCH] net/x25: Fix null-ptr-deref in x25_connect David Miller
2020-09-29 4:52 ` Martin Schiller
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=20200928092327.329-1-ms@dev.tdt.de \
--to=ms@dev.tdt.de \
--cc=andrew.hendry@gmail.com \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-x25@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=xiyuyang19@fudan.edu.cn \
/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 read-only IMAP folder(s) and NNTP newsgroup(s).