Re: [PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null

From	Colin Ian King <colin.king@canonical.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null
Date	2015-10-12 08:20 +0200
Message-ID	<qiECK-7jp-1@gated-at.bofh.it> (permalink)
References	<qhoJH-41D-11@gated-at.bofh.it> <qizjI-7Uc-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 12/10/15 01:35, Daniel Axtens wrote:
> 
> Hi Colin,
> 
> This looks good. Out of curiousity, how did you find it? Code
> inspection? Bug? Static analysis?

static analysis with cppcheck. I forgot to mention that in the commit
message.

> 
> Not that it's particularly meaningful for such a trivial fix, but FWIW
:
> 
> Reviewed-by: Daniel Axtens <dja@axtens.net>
> 
> Regards,
> Daniel
> 
> Colin King <colin.king@canonical.com> writes:
> 
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> pi_buff is being memset before it is sanity checked. Move the
>> memset after the null pi_buff sanity check to avoid an oops.
>>
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>>  arch/powerpc/platforms/pseries/hvcserver.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/platforms/pseries/hvcserver.c b/arch/powerp
c/platforms/pseries/hvcserver.c
>> index eedb645..94a6e56 100644
>> --- a/arch/powerpc/platforms/pseries/hvcserver.c
>> +++ b/arch/powerpc/platforms/pseries/hvcserver.c
>> @@ -142,11 +142,11 @@ int hvcs_get_partner_info(uint32_t unit_address
, struct list_head *head,
>>  	int more = 1;
>>  	int retval;
>>  
>> -	memset(pi_buff, 0x00, PAGE_SIZE);
>>  	/* invalid parameters */
>>  	if (!head || !pi_buff)
>>  		return -EINVAL;
>>  
>> +	memset(pi_buff, 0x00, PAGE_SIZE);
>>  	last_p_partition_ID = last_p_unit_address = ~0UL;
>>  	INIT_LIST_HEAD(head);
>>  
>> -- 
>> 2.5.0
>>
>> _______________________________________________
>> Linuxppc-dev mailing list
>> Linuxppc-dev@lists.ozlabs.org
>> https://lists.ozlabs.org/listinfo/linuxppc-dev

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Thread

[PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null Colin King <colin.king@canonical.com> - 2015-10-08 21:10 +0200
  Re: [PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null Daniel Axtens <dja@axtens.net> - 2015-10-12 02:40 +0200
    Re: [PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is  null Colin Ian King <colin.king@canonical.com> - 2015-10-12 08:20 +0200
  Re: powerpc/pseries/hvcserver: don't memset pi_buff if it is null Michael Ellerman <mpe@ellerman.id.au> - 2015-10-12 13:30 +0200

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