Validate the output buffer length for L2CAP config requests and responses
to avoid overflowing the stack buffer used for building the option blocks.

Cc: stable@vger.kernel.org
Signed-off-by: NBen Seri <ben@armis.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>