From: Sven Eckelmann <sven.eckelmann(a)open-mesh.com&gt; 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: 4f241fcea704 ("batman-adv: Include frame priority in fragment header") Signed-off-by: Sven Eckelmann <sven.eckelmann(a)open-mesh.com&gt; --- Cc: Andrew Lunn <andrew(a)lunn.ch&gt; --- 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 a98cf1104a30a30e66fb6018bef59dea83dc4b7a..ebe6e38934e46ed5de4d30204e791dbe40285fcc 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);