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

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Message-ID: <CAFo99gatLzLpOu92N23bMQ=a25BTnK3QK2rAzoQJcU3oxMuMgA@mail.gmail.com>
Date:	Sat, 17 May 2014 18:36:13 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"David S. Miller" <davem@...emloft.net>, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix for possible null pointer dereference in auth.c

Hi

I have made a new patch according Sergei specification.

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
>
>

View attachment "0001-Fix-for-possible-null-pointer-dereferenc.patch" of type "text/x-patch" (1202 bytes)