netdev - [PATCH 1/4] batman-adv: Always initialize fragment header priority

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Message-Id: <20171215113143.12852-2-sw@simonwunderlich.de>
Date:   Fri, 15 Dec 2017 12:31:40 +0100
From:   Simon Wunderlich <sw@...onwunderlich.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        Sven Eckelmann <sven.eckelmann@...n-mesh.com>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 1/4] batman-adv: Always initialize fragment header priority

From: Sven Eckelmann <sven.eckelmann@...n-mesh.com>

The batman-adv unuicast fragment header contains 3 bits for the priority of
the packet. These bits will be initialized when the skb->priority contains
a value between 256 and 263. But otherwise, the uninitialized bits from the
stack will be used.

Fixes: c0f25c802b33 ("batman-adv: Include frame priority in fragment header")
Signed-off-by: Sven Eckelmann <sven.eckelmann@...n-mesh.com>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
---
 net/batman-adv/fragmentation.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index a98cf1104a30..ebe6e38934e4 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -499,6 +499,8 @@ int batadv_frag_send_packet(struct sk_buff *skb,
 	 */
 	if (skb->priority >= 256 && skb->priority <= 263)
 		frag_header.priority = skb->priority - 256;
+	else
+		frag_header.priority = 0;
 
 	ether_addr_copy(frag_header.orig, primary_if->net_dev->dev_addr);
 	ether_addr_copy(frag_header.dest, orig_node->orig);
-- 
2.11.0