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List:       linux-s390
Subject:    [patch 3/4] qeth: Fix for possible null pointer dereference
From:       frank.blaschka () de ! ibm ! com
Date:       2014-05-28 8:22:30
Message-ID: 20140528082239.887823659 () de ! ibm ! com
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From: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>

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@spectrumdigital.se>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
---
 drivers/s390/net/qeth_core_main.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1013,7 +1013,7 @@ static long __qeth_check_irb_error(struc
 
 	card = CARD_FROM_CDEV(cdev);
 
-	if (!IS_ERR(irb))
+	if (!card || !IS_ERR(irb))
 		return 0;
 
 	switch (PTR_ERR(irb)) {
@@ -1029,7 +1029,7 @@ static long __qeth_check_irb_error(struc
 		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);
 			}

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