diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2016-10-18 16:53:59 +0200 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2016-10-21 14:36:44 +0200 |
commit | 1f1cc4566bd9dd8d3cf19965a4b6392143618536 (patch) | |
tree | 60ddc9a54e71d504c2ac0d2e79ceee6df0acd734 /drivers/gpio | |
parent | 67bf5156edc4f58241fd7c119ae145c552adddd6 (diff) | |
download | linux-1f1cc4566bd9dd8d3cf19965a4b6392143618536.tar.gz |
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/gpiolib.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f0fc3a0d37c8..dac975397253 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -839,7 +839,7 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) return -EFAULT; - if (lineinfo.line_offset > gdev->ngpio) + if (lineinfo.line_offset >= gdev->ngpio) return -EINVAL; desc = &gdev->descs[lineinfo.line_offset]; |