linux-kernel - Re: [PATCH] Check kmalloc return value before use the buffer

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Message-ID: <4BE3DF4D.7080602@crca.org.au>
Date:	Fri, 07 May 2010 19:37:17 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Steven Liu <lingjiujianke@...il.com>
CC:	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Check kmalloc return value before use the buffer

Hi.

No commit comment?

On 07/05/10 17:17, Steven Liu wrote:
> Signed-off-by: LiuQi<lingjiujianke@...il.com>
> ---
>   arch/arm/mach-u300/dummyspichip.c |    5 +++++
>   1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-u300/dummyspichip.c
> b/arch/arm/mach-u300/dummyspichip.c
> index 5f55012..df19f9b 100644
> --- a/arch/arm/mach-u300/dummyspichip.c
> +++ b/arch/arm/mach-u300/dummyspichip.c
> @@ -64,6 +64,11 @@ static ssize_t dummy_looptest(struct device *dev,
>   		goto out;
>   	}
>   	bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
> +	if (bigrxbuf_virtual == NULL) {
> +		status = -ENOMEM;
> +		kfree(bigtxbuf_virtual);

Why kfree something you know is NULL?

Regards,

Nigel
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