linux-kernel - Re: [syzbot] [hams?] possible deadlock in serial8250_console

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <000000000000cd73500616810b77@google.com>
Date: Fri, 19 Apr 2024 23:09:24 -0700
From: syzbot <syzbot+8e03da5d64bc85098811@...kaller.appspotmail.com>
To: aha310510@...il.com
Cc: aha310510@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hams?] possible deadlock in serial8250_console_write

> please test deadlock in serial8250_console_write
>
> #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

This crash does not have a reproducer. I cannot test it.

>
> ---
>  drivers/net/ppp/ppp_async.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
> index c33c3db3cc08..d12b8155e839 100644
> --- a/drivers/net/ppp/ppp_async.c
> +++ b/drivers/net/ppp/ppp_async.c
> @@ -134,11 +134,11 @@ static struct asyncppp *ap_get(struct tty_struct *tty)
>  {
>  	struct asyncppp *ap;
>  
> -	read_lock(&disc_data_lock);
> +	read_lock_irq(&disc_data_lock);
>  	ap = tty->disc_data;
>  	if (ap != NULL)
>  		refcount_inc(&ap->refcnt);
> -	read_unlock(&disc_data_lock);
> +	read_unlock_irq(&disc_data_lock);
>  	return ap;
>  }
>  
> -- 
> 2.34.1