linux-kernel - Re: [PATCH] Fix for possible null pointer dereference in auth.c

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Message-ID: <CAHQdGtRd-uKvRU8DD9zK-MEF0B10=rESrQAPJoQ8hTunwG883A@mail.gmail.com>
Date:	Sat, 17 May 2014 13:17:28 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"David S. Miller" <davem@...emloft.net>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Linux Kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fix for possible null pointer dereference in auth.c

On Sat, May 17, 2014 at 12:36 PM, Rickard Strandqvist
<rickard_strandqvist@...ctrumdigital.se> wrote:
> Hi
>
> I have made a new patch according Sergei specification.
>

I'll be happy to apply this patch once someone explains to me why we
can't just remove that check for cred != NULL, however I'm not
applying a patch purely in order to silence a warning from cppcheck.

Cheers,
   Trond

> But there remains Tronds question though.
>
> Best regards
> Rickard Strandqvist
>
>
> 2014-05-16 14:19 GMT+02:00 Sergei Shtylyov <sergei.shtylyov@...entembedded.com>:
>> Hello.
>>
>>
>> On 16-05-2014 1:56, 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>
>>> ---
>>>   net/sunrpc/auth.c |   10 +++++++---
>>>   1 fil ändrad, 7 tillägg(+), 3 borttagningar(-)
>>
>>
>>> diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
>>> index 5285ead..3a55698 100644
>>> --- a/net/sunrpc/auth.c
>>> +++ b/net/sunrpc/auth.c
>>> @@ -801,10 +801,14 @@ rpcauth_invalcred(struct rpc_task *task)
>>>   {
>>>         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
>>>
>>> -       dprintk("RPC: %5u invalidating %s cred %p\n",
>>> -               task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
>>> -       if (cred)
>>> +       if (cred) {
>>> +               dprintk("RPC: %5u invalidating %s cred %p\n",
>>> +                       task->tk_pid, cred->cr_auth->au_ops->au_name,
>>> cred);
>>> +
>>>                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
>>> +       }
>>> +       else
>>
>>
>>    } and *else* should be on the same line, and there should be {} in the
>> *else* arm since there's {} in the *if* arm already, according to
>> Documentation/CodingStyle.
>>
>>
>>> +               dprintk("RPC: %5u invalidating is NULL\n", task->tk_pid);
>>
>>
>>    That's not a proper English, I'm afraid.
>>
>>>   }
>>
>>
>> WBR, Sergei
>>
>>



-- 
Trond Myklebust

Linux NFS client maintainer, PrimaryData

trond.myklebust@...marydata.com
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