linux-kernel - Re: [PATCH] x86: uv: Fix potential NULL pointer dereference of kmalloc

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Message-ID: <cb87945edeeda2529b75e2169ff6f723daa732b2.camel@perches.com>
Date:   Sat, 02 Mar 2019 13:12:49 -0800
From:   Joe Perches <joe@...ches.com>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Nicolai Stange <nstange@...e.de>,
        Kees Cook <keescook@...omium.org>,
        Andrew Banman <abanman@....com>,
        Mike Travis <mike.travis@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Varsha Rao <rvarsha016@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: uv: Fix potential NULL pointer dereference of
 kmalloc_node

On Sat, 2019-03-02 at 15:09 -0600, Aditya Pakki wrote:
> kmalloc_node might fail to allocate memory for thp field. This fix
> attempts to avoid a potential NULL pointer dereference.

right

> diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
[]
> @@ -2011,6 +2011,9 @@ static void make_per_cpu_thp(struct bau_control *smaster)
>  	size_t hpsz = sizeof(struct hub_and_pnode) * num_possible_cpus();
>  
>  	smaster->thp = kmalloc_node(hpsz, GFP_KERNEL, smaster->osnode);
> +	if (!smaster->thp)
> +		return;
> +
>  	memset(smaster->thp, 0, hpsz);

Could use kzalloc_node as well