netdev - [PATCH] Fix for possible null pointer dereference in auth.c

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Date:	Thu, 15 May 2014 23:56:38 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	"J. Bruce Fields" <bfields@...ldses.org>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	"David S. Miller" <davem@...emloft.net>, linux-nfs@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix for possible null pointer dereference in auth.c

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);
 }
 
 int
-- 
1.7.10.4

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