linux-kernel - [PATCH] flow_dissector: Pre-initialize ip_proto in __skb_flow

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Message-Id: <1435237832-28838-1-git-send-email-geert@linux-m68k.org>
Date:	Thu, 25 Jun 2015 15:10:32 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <tom@...bertland.com>,
	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] flow_dissector: Pre-initialize ip_proto in __skb_flow_dissect()

net/core/flow_dissector.c: In function ‘__skb_flow_dissect’:
net/core/flow_dissector.c:132: warning: ‘ip_proto’ may be used uninitialized in this function

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
This may be a false positive, but the state machine in
__skb_flow_dissect() is a bit hard to follow.
As I believe it is controlled by a packet received from the network, the
only safe thing to do is to pre-initialize ip_proto.
---
 net/core/flow_dissector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 476e5dda59e19822..2a834c6179b9973e 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -129,7 +129,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 	struct flow_dissector_key_ports *key_ports;
 	struct flow_dissector_key_tags *key_tags;
 	struct flow_dissector_key_keyid *key_keyid;
-	u8 ip_proto;
+	u8 ip_proto = 0;
 
 	if (!data) {
 		data = skb->data;
-- 
1.9.1

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