linux-kernel - [PATCH] staging/wlan-ng: Fix 'Branch condition evaluates to a garbage value' in p80211netdev.c

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Date:	Thu, 14 Feb 2013 03:37:10 +0100
From:	Peter Huewe <peterhuewe@....de>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Devendra Naga <devendra.aaru@...il.com>,
	Peter Huewe <peterhuewe@....de>,
	Sebastiaan de Haan <sebastiaan@...astiaandehaan.org>,
	"Justin P. Mattock" <justinmattock@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging/wlan-ng: Fix 'Branch condition evaluates to a garbage value' in p80211netdev.c

clang/scan-build complains that:
p80211netdev.c:451:6: warning: Branch condition evaluates to a garbage
value
        if ((p80211_wep.data) && (p80211_wep.data != skb->data))
	            ^~~~~~~~~~~~~~~~~

This can happen in p80211knetdev_hard_start_xmit if
- if (wlandev->state != WLAN_DEVICE_OPEN) evaluates to true.
the execution flow then continues at the 'failed' label where
p80211_wep.data is used without being initialized first.

-> Initialize the data field to NULL to fix this issue.

Signed-off-by: Peter Huewe <peterhuewe@....de>
---
 drivers/staging/wlan-ng/p80211netdev.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/wlan-ng/p80211netdev.c b/drivers/staging/wlan-ng/p80211netdev.c
index 750330f..0039e08 100644
--- a/drivers/staging/wlan-ng/p80211netdev.c
+++ b/drivers/staging/wlan-ng/p80211netdev.c
@@ -351,6 +351,8 @@ static int p80211knetdev_hard_start_xmit(struct sk_buff *skb,
 	union p80211_hdr p80211_hdr;
 	struct p80211_metawep p80211_wep;
 
+	p80211_wep.data = NULL;
+
 	if (skb == NULL)
 		return NETDEV_TX_OK;
 
-- 
1.7.8.6

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