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

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Message-ID: <e867e419-fa9f-e67f-bbfb-5261874c9d29@amd.com>
Date:   Tue, 22 Feb 2022 12:31:52 +0100
From:   Christian König <christian.koenig@....com>
To:     xkernel.wang@...mail.com, sumit.semwal@...aro.org
Cc:     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()



Am 22.02.22 um 12:30 schrieb xkernel.wang@...mail.com:
> 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.
>
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>

Acked-by: Christian König <christian.koenig@....com>

> ---
>   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;