netdev - Re: [PATCH] net/x25: fix nonblocking connect

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Date:   Thu, 09 Jan 2020 18:40:08 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     ms@....tdt.de
Cc:     arnd@...db.de, andrew.hendry@...il.com, edumazet@...gle.com,
        gregkh@...uxfoundation.org, tglx@...utronix.de,
        linux-x25@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        syzbot+429c200ffc8772bfe070@...kaller.appspotmail.com,
        syzbot+eec0c87f31a7c3b66f7b@...kaller.appspotmail.com
Subject: Re: [PATCH] net/x25: fix nonblocking connect

From: Martin Schiller <ms@....tdt.de>
Date: Thu,  9 Jan 2020 07:31:14 +0100

> This patch fixes 2 issues in x25_connect():
> 
> 1. It makes absolutely no sense to reset the neighbour and the
> connection state after a (successful) nonblocking call of x25_connect.
> This prevents any connection from being established, since the response
> (call accept) cannot be processed.
> 
> 2. Any further calls to x25_connect() while a call is pending should
> simply return, instead of creating new Call Request (on different
> logical channels).
> 
> This patch should also fix the "KASAN: null-ptr-deref Write in
> x25_connect" and "BUG: unable to handle kernel NULL pointer dereference
> in x25_connect" bugs reported by syzbot.
> 
> Signed-off-by: Martin Schiller <ms@....tdt.de>
> Reported-by: syzbot+429c200ffc8772bfe070@...kaller.appspotmail.com
> Reported-by: syzbot+eec0c87f31a7c3b66f7b@...kaller.appspotmail.com

Applied and queued up for -stable, thanks.