linux-kernel - Re: [PATCH] lib: Use kzalloc() instead of kmalloc() with flag GFP

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Message-ID: <CAG_fn=UGmEMyjASasZTK3cXAZzJ4tb9wCGsW1FoA+kPNJiW1Gw@mail.gmail.com>
Date:   Wed, 12 Feb 2020 10:56:16 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Yi Wang <wang.yi59@....com.cn>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>, xue.zhihong@....com.cn,
        wang.liang82@....com.cn, Huang Zijiang <huang.zijiang@....com.cn>
Subject: Re: [PATCH] lib: Use kzalloc() instead of kmalloc() with flag GFP_ZERO.

On Wed, Feb 12, 2020 at 10:54 AM Yi Wang <wang.yi59@....com.cn> wrote:
>
> From: Huang Zijiang <huang.zijiang@....com.cn>
>
> Use kzalloc instead of manually setting kmalloc
> with flag GFP_ZERO since kzalloc sets allocated memory
> to zero.
>
> Change in v2:
>     add indation
>
> Signed-off-by: Huang Zijiang <huang.zijiang@....com.cn>
> Signed-off-by: Yi Wang <wang.yi59@....com.cn>
Reviewed-by: Alexander Potapenko <glider@...gle.com>
> ---
>  lib/test_kasan.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index 328d33b..79be158 100644
> --- a/lib/test_kasan.c
> +++ b/lib/test_kasan.c
> @@ -599,7 +599,7 @@ static noinline void __init kasan_memchr(void)
>         size_t size = 24;
>
>         pr_info("out-of-bounds in memchr\n");
> -       ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
> +       ptr = kzalloc(size, GFP_KERNEL);
>         if (!ptr)
>                 return;
>
> @@ -614,7 +614,7 @@ static noinline void __init kasan_memcmp(void)
>         int arr[9];
>
>         pr_info("out-of-bounds in memcmp\n");
> -       ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
> +       ptr = kzalloc(size, GFP_KERNEL);
>         if (!ptr)
>                 return;
>
> @@ -629,7 +629,7 @@ static noinline void __init kasan_strings(void)
>         size_t size = 24;
>
>         pr_info("use-after-free in strchr\n");
> -       ptr = kmalloc(size, GFP_KERNEL | __GFP_ZERO);
> +       ptr = kzalloc(size, GFP_KERNEL);
>         if (!ptr)
>                 return;
>
> --
> 1.9.1
>
> --
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-- 
Alexander Potapenko
Software Engineer

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