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

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Message-ID: <4BE4BDED.5050406@tuxonice.net>
Date:	Sat, 08 May 2010 11:27:09 +1000
From:	Nigel Cunningham <nigel@...onice.net>
To:	Linus WALLEIJ <linus.walleij@...ricsson.com>
CC:	Steven Liu <lingjiujianke@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Check kmalloc return value before use the buffer

Hi again.

On 08/05/10 04:57, Linus WALLEIJ wrote:
> [Steven]
>
>> the code in arch/arm/mach-u300/dummyspichip.c is
>>
>>      bigtxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
>>      if (bigtxbuf_virtual == NULL) {
>>          status = -ENOMEM;
>>          goto out;
>>      }
>>      bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
>>
>>
>> if kmalloc memory space for bigrxbuf_virtual is NULL, when it have
>> kmalloc DMA_TEST_SIZE memory space for bigtxbuf_virtual,so ,if kmalloc
>> memory for bigtxbuf_virtual success and kmalloc memory for
>> bigrxbuf_virtual faild,i think we must kfree  bigtxbuf_virtual memory
>
> Ha, I also misread tx for rx, sorry.

I've just looked again, and the original version did have rx in the 
test. We weren't seeing things :)

> Acked-by: Linus Walleij<linus.walleij@...ricsson.com>

Acked-by: Nigel Cunningham <nigel@...onice.net>

Regards,

Nigel
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