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authorMarcel Holtmann <marcel@holtmann.org>2012-02-20 14:50:36 +0100
committerJohan Hedberg <johan.hedberg@intel.com>2012-02-20 15:59:11 +0200
commite0edf3733fb62f91bbb8ec3fab4a90b0ac2dd037 (patch)
tree59e8d01b911454141d53c4e08d9af9ed271abdcf /mm/page_io.c
parent7cc2ade2cbc6f71090f0f8d0e11cb68886ddc65e (diff)
Bluetooth: Fix issue with shared SKB between HCI raw socket and driver
Any HCI raw socket gets a copy of each SKB that is either received or send via the Bluetooth subsystem. The raw socket uses SKB clones to send out data, but the problem is that it needs to add an extra packet type byte in front of it. And some drivers need to also add an extra header before submitting the packet. So far this all worked magically fine since all of the drivers and the raw sockets are adding the same byte at the same location. But that is by pure coincidence. Since the data of cloned SKBs is shared, this means that the raw socket and driver kept writing into the shared data area. To fix this the only safe way is if the HCI raw socket creates a copy of the SKB before sending it out. To not always copy all SKBs around, the copy is only created once and only after any of the HCI filter checks succeeded. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Diffstat (limited to 'mm/page_io.c')
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