linux-kernel - Re: [PATCH] staging: lustre: lustre: obdclass: lprocfs_status.c: Fix for possible null pointer dereference

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Message-ID: <CAFo99gZicosRYW-8mAp2YHnM_R=UTbJ51ih1duRq+Cd9XB_p-A@mail.gmail.com>
Date:	Sun, 14 Dec 2014 23:43:25 +0100
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Oleg Drokin <oleg.drokin@...el.com>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Greg Donald <gdonald@...il.com>,
	"John L. Hammond" <john.hammond@...el.com>,
	Andriy Skulysh <Andriy_Skulysh@...atex.com>,
	Fabian Frederick <fabf@...net.be>,
	James Simmons <uja.ornl@...il.com>, HPDD-discuss@...ts.01.org,
	devel@...verdev.osuosl.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: lustre: lustre: obdclass: lprocfs_status.c: Fix
 for possible null pointer dereference

Sorry! extremely stupid. Sending new patch immediately.

Kind regards
Rickard Strandqvist


2014-12-14 23:39 GMT+01:00 Greg Kroah-Hartman <gregkh@...uxfoundation.org>:
> On Sun, Dec 14, 2014 at 11:36:22PM +0100, Rickard Strandqvist wrote:
>> There is otherwise a risk of a possible null pointer dereference.
>>
>> Was largely found by using a static code analysis program called cppcheck.
>>
>> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
>> ---
>>  .../lustre/lustre/obdclass/lprocfs_status.c        |   20 +++++++++-----------
>>  1 file changed, 9 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
>> index 61e04af..4a7891a 100644
>> --- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
>> +++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
>> @@ -1897,17 +1897,15 @@ int lprocfs_write_frac_u64_helper(const char *buffer, unsigned long count,
>>       }
>>
>>       units = 1;
>> -     switch (*end) {
>> -     case 'p': case 'P':
>> -             units <<= 10;
>> -     case 't': case 'T':
>> -             units <<= 10;
>> -     case 'g': case 'G':
>> -             units <<= 10;
>> -     case 'm': case 'M':
>> -             units <<= 10;
>> -     case 'k': case 'K':
>> -             units <<= 10;
>> +     if (end) {
>> +             switch (*end) {
>> +             case 'p': case 'P':
>> +             case 't': case 'T':
>> +             case 'g': case 'G':
>> +             case 'm': case 'M':
>> +             case 'k': case 'K':
>> +                     units <<= 10;
>> +             }
>
> You know you just changed the logic in the code, right?
>
> Why?  Have you tested this?
>
> greg k-h
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