UPSTREAM: USB: serial: io_ti: fix information leak in completion handler
Add missing sanity check to the bulk-in completion handler to avoid an
integer underflow that can be triggered by a malicious device.
This avoids leaking 128 kB of memory content from after the URB transfer
buffer to user space.
BUG=chromium:725017
TEST=Build and run
Change-Id: I5e6c6c6f09b06637f1f96bf7c7dfe32bf4ec14ff
Fixes: 8c209e6782ca ("USB: make actual_length in struct urb field u32")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org> # 2.6.30
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
(cherry picked from commit 654b404f2a2)
Reviewed-on: https://chromium-review.googlesource.com/514444
Reviewed-by: Dylan Reid <dgreid@chromium.org>
(cherry picked from commit 684dbc9bd2478f727cbd712bcad8e3fd0343a561)
Reviewed-on: https://chromium-review.googlesource.com/515204
1 file changed
