Re: [PATCH net] qmi_wwan: Add missing skb_reset_mac_header-call

From: Kristian Evensen <redacted>
Date: Tue,  7 Nov 2017 13:47:56 +0100

When we receive a packet on a QMI device in raw IP mode, we should call
skb_reset_mac_header() to ensure that skb->mac_header contains a valid
offset in the packet. While it shouldn't really matter, the packets have
no MAC header and the interface is configured as-such, it seems certain
parts of the network stack expects a "good" value in skb->mac_header.

Without the skb_reset_mac_header() call added in this patch, for example
shaping traffic (using tc) triggers the following oops on the first
received packet:

 ...

While the oops is for a 4.9-kernel, I was able to trigger the same oops with
net-next as of yesterday.

Signed-off-by: Kristian Evensen <redacted>

Applied, with Fixes: tag added, and queued up for -stable.

Thanks!