tree c360de77dadefba80979d0e0c7d1bddb8d9fd21a
parent c9a9f1bfdc454ad8c9564949ef686a6f9dc63f68
author Grant Hernandez <granthernandez@google.com> 1563004812 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1564904006 +0200

Input: gtco - bounds check collection indent level

commit 2a017fd82c5402b3c8df5e3d6e5165d9e6147dc1 upstream.

The GTCO tablet input driver configures itself from an HID report sent
via USB during the initial enumeration process. Some debugging messages
are generated during the parsing. A debugging message indentation
counter is not bounds checked, leading to the ability for a specially
crafted HID report to cause '-' and null bytes be written past the end
of the indentation array. As long as the kernel has CONFIG_DYNAMIC_DEBUG
enabled, this code will not be optimized out.  This was discovered
during code review after a previous syzkaller bug was found in this
driver.

Signed-off-by: Grant Hernandez <granthernandez@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>