linux-kernel - Re: [PATCH] x86: fix potential memleak in do_error

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Message-ID: <20160523153355.GA8449@redhat.com>
Date:	Mon, 23 May 2016 17:33:55 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Aleksa Sarai <asarai@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH] x86: fix potential memleak in do_error_trap

On 05/23, Michal Hocko wrote:
>
> @@ -271,6 +271,7 @@ static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
>
>  	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
>  			NOTIFY_STOP) {
> +		memset(&info, 0, sizeof(info));
>  		cond_local_irq_enable(regs);
>  		do_trap(trapnr, signr, str, regs, error_code,
>  			fill_trap_info(regs, signr, trapnr, &info));

at first glance fill_trap_info() initializes everything we will copy
to user-space in copy_siginfo_to_user(__SI_FAULT).

But even if not, shuldn't we change fill_trap_info() instead ?

Oleg.