From: Sven Eckelmann <sven.eckelmann-2BnEqQcu77q1Z/+hSey0Gg@public.gmane.org>

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-2BnEqQcu77q1Z/+hSey0Gg@public.gmane.org>
Signed-off-by: Simon Wunderlich <redacted>
---
 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