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Subject[PATCH 4.14 68/99] batman-adv: Always initialize fragment header priority
Date
From: Sven Eckelmann <sven.eckelmann@open-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@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/batman-adv/fragmentation.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -500,6 +500,8 @@ 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);

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