tree 60ddc9a54e71d504c2ac0d2e79ceee6df0acd734
parent 67bf5156edc4f58241fd7c119ae145c552adddd6
author Lars-Peter Clausen <lars@metafoo.de> 1476802439 +0200
committer Linus Walleij <linus.walleij@linaro.org> 1477053404 +0200

gpio: GPIO_GET_CHIPINFO_IOCTL: Fix line offset validation

The current line offset validation is off by one. Depending on the data
stored behind the descs array this can either cause undefined behavior or
disclose arbitrary, potentially sensitive, memory to the issuing userspace
application.

Make sure that offset is within the bounds of the desc array.

Cc: stable@vger.kernel.org
Fixes: 521a2ad6f862 ("gpio: add userspace ABI for GPIO line information")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>