tree ab1bcdcb384c34819fadbdf38dde2dda4a6d2ca5
parent 654b404f2a222f918af9b0cd18ad469d0c941a8e
author Johan Hovold <johan@kernel.org> 1488818201 +0100
committer Johan Hovold <johan@kernel.org> 1488986082 +0100

USB: serial: safe_serial: fix information leak in completion handler

Add missing sanity check to the bulk-in completion handler to avoid an
integer underflow that could be triggered by a malicious device.

This avoids leaking up to 56 bytes from after the URB transfer buffer to
user space.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>