Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 13 Dec 2018 13:33:06 +0100
From:   Petr Mladek <pmladek@suse.com>
To:     Nicholas Mc Guire <hofrat@osadl.org>
Cc:     Josh Poimboeuf <jpoimboe@redhat.com>, Jessica Yu <jeyu@kernel.org>,
        Jiri Kosina <jikos@kernel.org>,
        Miroslav Benes <mbenes@suse.cz>, live-patching@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] livepatch: handle kzalloc failure
Message-ID: <20181213123306.g7ond2gy6vqq7sge@pathway.suse.cz>
References: <1544699390-15673-1-git-send-email-hofrat@osadl.org>
 <1544699390-15673-2-git-send-email-hofrat@osadl.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1544699390-15673-2-git-send-email-hofrat@osadl.org>
User-Agent: NeoMutt/20170421 (1.8.2)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu 2018-12-13 12:09:50, Nicholas Mc Guire wrote:
> kzalloc() return should be checked. On dummy_alloc() failing
> in kzalloc() NULL should be returned.
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
> ---
> 
> Problem was located with an experimental coccinelle script
> 
> Patch was compile tested with: x86_64_defconfig + FTRACE=y
> FUNCTION_TRACER=y, EXPERT=y, LATENCYTOP=y, SAMPLES=y, SAMPLE_LIVEPATCH=y
> (with a number of unrelated sparse warnings on symbols not being static)
> 
> Patch is against 4.20-rc6 (localversion-next is next-20181213)
> 
>  samples/livepatch/livepatch-shadow-mod.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/samples/livepatch/livepatch-shadow-mod.c b/samples/livepatch/livepatch-shadow-mod.c
> index 4c54b25..57d5cde 100644
> --- a/samples/livepatch/livepatch-shadow-mod.c
> +++ b/samples/livepatch/livepatch-shadow-mod.c
> @@ -118,6 +118,8 @@ noinline struct dummy *dummy_alloc(void)
>  
>  	/* Oops, forgot to save leak! */
>  	leak = kzalloc(sizeof(int), GFP_KERNEL);
> +	if (!leak)
> +		return NULL;

The same comments apply here as for PATCH 1/2.

Best Regards,
Petr