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commit 9e478066eae41211c92a8f63cc69aafc391bd6ab 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>
87cfeaa5e5