linux-kernel - Re: [PATCH] dma-buf: check the return value of kstrdup()

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Date:   Tue, 22 Feb 2022 19:11:46 +0530
From:   Sumit Semwal <sumit.semwal@...aro.org>
To:     xkernel.wang@...mail.com
Cc:     christian.koenig@....com, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-buf: check the return value of kstrdup()

Hi Xiaoke,

On Tue, 22 Feb 2022 at 17:00, <xkernel.wang@...mail.com> wrote:
>
> From: Xiaoke Wang <xkernel.wang@...mail.com>
>
> kstrdup() is a memory allocation function which can return NULL when
> some internaly memory errors happen. It is better to check the return
> value of it to prevent further wrong memory access.
Thanks for the patch; looks sane.
>
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Acked-by: Sumit Semwal <sumit.semwal@...aro.org>

Will queue it up.
> ---
>  drivers/dma-buf/selftest.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/dma-buf/selftest.c b/drivers/dma-buf/selftest.c
> index c60b694..2c29e2a 100644
> --- a/drivers/dma-buf/selftest.c
> +++ b/drivers/dma-buf/selftest.c
> @@ -50,6 +50,9 @@ static bool apply_subtest_filter(const char *caller, const char *name)
>         bool result = true;
>
>         filter = kstrdup(__st_filter, GFP_KERNEL);
> +       if (!filter)
> +               return false;
> +
>         for (sep = filter; (tok = strsep(&sep, ","));) {
>                 bool allow = true;
>                 char *sl;
> --


Best,
Sumit.