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

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Date:	Fri, 7 May 2010 15:16:34 +0800
From:	Steven Liu <lingjiujianke@...il.com>
To:	Linus WALLEIJ <linus.walleij@...ricsson.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Check kmalloc return value before use the buffer

Oh,I think I have a mistake


Signed-off-by: root <root@...agwell.(none)>
---
 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);
+		goto out;
+	}

 	/* Fill TXBUF with some happy pattern */
 	memset(bigtxbuf_virtual, 0xAA, DMA_TEST_SIZE);
-- 
1.6.0.3





what a bout this one, please?


Best regards!



2010/5/7 Linus WALLEIJ <linus.walleij@...ricsson.com>:
> Hi Liu,
>
>> Hi,linus.walleij
>>
>>           Check kmalloc return value before use the buffer
>>
>>
>> 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 962f9de..4f2af7c 100644
>> --- a/arch/arm/mach-u300/dummyspichip.c
>> +++ b/arch/arm/mach-u300/dummyspichip.c
>> @@ -63,6 +63,11 @@ static ssize_t dummy_looptest(struct device *dev,
>>               goto out;
>>       }
>>       bigrxbuf_virtual = kmalloc(DMA_TEST_SIZE, GFP_KERNEL);
>> +     if (bigtxbuf_virtual == NULL) {
>> +             status = -ENOMEM;
>> +             kfree(bigtxbuf_virtual);
>
> kfree():ing NULL is OK, but you just checked it to be NULL so why?
>
>> +             goto out;
>> +     }
>>
>>       /* Fill TXBUF with some happy pattern */
>>       memset(bigtxbuf_virtual, 0xAA, DMA_TEST_SIZE);
>
> Otherwise the bug it fixes is good to fix.
>
> Yours,
> Linus Walleij
>
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