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

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Message-ID: <8c14879c-891d-db56-2dca-cd3b68afce2d@embeddedor.com>
Date:   Sat, 2 Mar 2019 15:22:29 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.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

Hi Aditya,

On 3/2/19 3:09 PM, Aditya Pakki wrote:
> kmalloc_node might fail to allocate memory for thp field. This fix
> attempts to avoid a potential NULL pointer dereference.
>

If this was detected by any static analyzer, please mention the
tool in the commit log.

Also, notice that this code does not apply to linux-next.

Thanks
--
Gustavo

> Signed-off-by: Aditya Pakki <pakki001@....edu>
> ---
>  arch/x86/platform/uv/tlb_uv.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
> index a4130b84d1ff..5a6d51e30a36 100644
> --- 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);
>  	for_each_present_cpu(cpu) {
>  		smaster->thp[cpu].pnode = uv_cpu_hub_info(cpu)->pnode;
>