linux-kernel - [PATCH] isdn: hisax: l3dss1.c: Fix for possible null pointer dereference

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Date:	Sat, 17 May 2014 19:18:21 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Karsten Keil <isdn@...ux-pingi.de>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] isdn: hisax: l3dss1.c:  Fix for possible null pointer dereference

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>
---
 drivers/isdn/hisax/l3dss1.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/isdn/hisax/l3dss1.c b/drivers/isdn/hisax/l3dss1.c
index cda7006..3ea6257 100644
--- a/drivers/isdn/hisax/l3dss1.c
+++ b/drivers/isdn/hisax/l3dss1.c
@@ -2208,8 +2208,12 @@ static int l3dss1_cmd_global(struct PStack *st, isdn_ctrl *ic)
 				{ free_invoke_id(st, id);
 					return (-2);
 				}
-			pc->prot.dss1.ll_id = ic->parm.dss1_io.ll_id; /* remember id */
-			pc->prot.dss1.proc = ic->parm.dss1_io.proc; /* and procedure */
+
+			if (pc)
+			{
+				pc->prot.dss1.ll_id = ic->parm.dss1_io.ll_id; /* remember id */
+				pc->prot.dss1.proc = ic->parm.dss1_io.proc; /* and procedure */
+			}
 
 			if (!(skb = l3_alloc_skb(l)))
 			{ free_invoke_id(st, id);
-- 
1.7.10.4

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