Bluetooth: bfusb: validate received block boundaries

The USB receive path trusts the block header to contain the required
number of bytes and passes it to the reassembly routine. The routine
also trusts a malformed HCI packet type and can append more data than
the skb allocated from the advertised packet length. A malformed USB
transfer can therefore cause out-of-bounds reads or an skb tail
overwrite.

Validate block header availability, declared block size, packet type,
and reassembly tailroom. Drop the partial frame on an invalid block.

Signed-off-by: Li Qiang <liqiang01@kylinos.cn>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

0 files changed, 0 insertions, 0 deletions