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

[Tianjia Zhang]

Hi Zizhuang,

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@xxxxxxxxx>
> ---
>   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);
>   

Remove this empty line.

> +	if (!ctx) {
> +		return NULL;
> +	}
> +
>   	if (copy) {
>   		ctx->m = mpi_copy(m);
>   		ctx->m_copied = 1;


Thanks for pointing it out. Please send a copy to linux-crypto and 
Herbert Xu.

Best regards,
Tianjia