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

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Date:	Thu, 15 May 2014 18:07:01 -0400
From:	Trond Myklebust <trond.myklebust@...marydata.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	"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

On Thu, May 15, 2014 at 5:56 PM, Rickard Strandqvist
<rickard_strandqvist@...ctrumdigital.se> 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
> +               dprintk("RPC: %5u invalidating is NULL\n", task->tk_pid);
>  }
>
>

Can you please explain how we can get to rpcauth_invalcred() without a
valid cred pointer? I'm not seeing it...

Cheers
  Trond
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