mac80211: fix MU-MIMO follow-MAC mode

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commit 9e478066ea upstream.

There are two bugs in the follow-MAC code:
 * it treats the radiotap header as the 802.11 header
   (therefore it can't possibly work)
 * it doesn't verify that the skb data it accesses is actually
   present in the header, which is mitigated by the first point

Fix this by moving all of this out into a separate function.
This function copies the data it needs using skb_copy_bits()
to make sure it can be accessed if it's paged, and offsets
that by the possibly present vendor radiotap header.

This also makes all those conditions more readable.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Johannes Berg 2017-04-13 14:23:49 +02:00 • committed by Greg Kroah-Hartman

parent e0411f1eb5

commit 87cfeaa5e5

1 changed files with 47 additions and 18 deletions

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net/mac80211/rx.c

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