linux-kernel - Re: [PATCH] tty/n_gsm.c: fix a memory leak in gsmld

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: <53D60E8F.6080208@suse.cz>
Date:	Mon, 28 Jul 2014 10:49:19 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	"xinhui.pan" <xinhuix.pan@...el.com>,
	Greg KH <gregkh@...uxfoundation.org>
CC:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Hurley <peter@...leysoftware.com>,
	mnipxh <mnipxh@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty/n_gsm.c: fix a memory leak in gsmld_open

On 07/28/2014 10:14 AM, xinhui.pan wrote:
> If gsmld_attach_gsm fails, the gsm is not used anymore.
> tty core will not call gsmld_close to do the cleanup work.
> tty core just restore to the tty old ldisc.
> That always causes memory leak.

Nice catch!

> --- a/drivers/tty/n_gsm.c
> +++ b/drivers/tty/n_gsm.c
> @@ -2382,7 +2383,13 @@ static int gsmld_open(struct tty_struct *tty)
>  
>  	/* Attach the initial passive connection */
>  	gsm->encoding = 1;
> -	return gsmld_attach_gsm(tty, gsm);
> +
> +	ret = gsmld_attach_gsm(tty, gsm);
> +	if (ret != 0) {
> +		gsm_cleanup_mux(gsm);
> +		mux_put(gsm);

It is quite illogical to put the mux here. It should be in gsmld_open.
I.e. gsm_cleanup_mux here, mux_put there.

thanks,
-- 
js
suse labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/