linux-kernel - [PATCH] s390: net: qeth_core_main.c: Fix for possible null pointer dereference

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Message-Id: <1400429068-10607-1-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Sun, 18 May 2014 18:04:27 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] s390: net: qeth_core_main.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/s390/net/qeth_core_main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 22470a3..5562665 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1012,7 +1012,7 @@ static long __qeth_check_irb_error(struct ccw_device *cdev,
 
 	card = CARD_FROM_CDEV(cdev);
 
-	if (!IS_ERR(irb))
+	if (!card || !IS_ERR(irb))
 		return 0;
 
 	switch (PTR_ERR(irb)) {
@@ -1028,7 +1028,7 @@ static long __qeth_check_irb_error(struct ccw_device *cdev,
 		QETH_CARD_TEXT(card, 2, "ckirberr");
 		QETH_CARD_TEXT_(card, 2, "  rc%d", -ETIMEDOUT);
 		if (intparm == QETH_RCD_PARM) {
-			if (card && (card->data.ccwdev == cdev)) {
+			if (card->data.ccwdev == cdev) {
 				card->data.state = CH_STATE_DOWN;
 				wake_up(&card->wait_q);
 			}
-- 
1.7.10.4

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