linux-kernel - Re: [PATCH] lib/mpi: add the return value check of kcalloc

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Message-ID: <d31d1244-76a2-f736-f6db-701346d8e96f@linux.alibaba.com>
Date:   Thu, 30 Dec 2021 14:45:47 +0800
From:   Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
To:     Zizhuang Deng <sunsetdzz@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/mpi: add the return value check of kcalloc



On 12/30/21 10:51 AM, Zizhuang Deng wrote:
> Add the return value check of kcalloc to avoid potential
> NULL ptr dereference.
> 
> Signed-off-by: Zizhuang Deng <sunsetdzz@...il.com>
> ---
>   lib/mpi/mpi-mod.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/lib/mpi/mpi-mod.c b/lib/mpi/mpi-mod.c
> index 47bc59edd4ff..6fd6900f0798 100644
> --- a/lib/mpi/mpi-mod.c
> +++ b/lib/mpi/mpi-mod.c
> @@ -41,6 +41,10 @@ mpi_barrett_t mpi_barrett_init(MPI m, int copy)
>   	mpi_normalize(m);
>   	ctx = kcalloc(1, sizeof(*ctx), GFP_KERNEL);
>   
> +	if (!ctx) {
> +		return NULL;
> +	}
> +

Delete the pair of curly braces, and just keep:

	if (!ctx)
		return NULL;

Thanks.

>   	if (copy) {
>   		ctx->m = mpi_copy(m);
>   		ctx->m_copied = 1;