Re: [PATCH net,stable] net: cdc_mbim: handle unaccelerated VLAN tagged frames

From: Bjørn Mork <redacted>
Date: Fri,  9 May 2014 14:45:00 +0200

This driver maps 802.1q VLANs to MBIM sessions. The mapping is based on
a bogus assumption that all tagged frames will use the acceleration API
because we enable NETIF_F_HW_VLAN_CTAG_TX. This fails for e.g. frames
tagged in userspace using packet sockets. Such frames will erroneously
be considered as untagged and silently dropped based on not being IP.

Fix by falling back to looking into the ethernet header for a tag if no
accelerated tag was found.

Fixes: a82c7ce5bc5b ("net: cdc_ncm: map MBIM IPS SessionID to VLAN ID")
Cc: Greg Suarez <redacted>
Signed-off-by: Bjørn Mork <redacted>

Applied, thank you!

This bug has been present since the driver was introduced in v3.8, and
should therefore be applied to all maintained stable kernels from v3.8
and onwards.  I have verified that it applies cleanly to the original
v3.8 version as well as the current net/master, so I believe it should
apply unmodified all versions in between.

This annotation is very much appreciated, because when I process my
-stable queue this information in right there waiting for me in the
patchwork bundle I create.
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