linux-kernel - [PATCH 4.9 59/90] batman-adv: Always initialize fragment header priority

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Message-Id: <20200319123946.794943115@linuxfoundation.org>
Date:   Thu, 19 Mar 2020 14:00:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sven Eckelmann <sven.eckelmann@...n-mesh.com>,
        Simon Wunderlich <sw@...onwunderlich.de>
Subject: [PATCH 4.9 59/90] batman-adv: Always initialize fragment header priority

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

commit fe77d8257c4d838c5976557ddb87bd789f312412 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/batman-adv/fragmentation.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -484,6 +484,8 @@ int batadv_frag_send_packet(struct sk_bu
 	 */
 	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);