| Message ID | 20200703111518.9644-1-novikov@ispras.ru (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow | expand |
On Fri, Jul 03, 2020 at 02:15:18PM +0300, Evgeny Novikov wrote: > aspeed_create_fan() reads a pwm_port value using of_property_read_u32(). > If pwm_port will be more than ARRAY_SIZE(pwm_port_params), there will be > a buffer overflow in > aspeed_create_pwm_port()->aspeed_set_pwm_port_enable(). The patch fixes > the potential buffer overflow. > > Found by Linux Driver Verification project (linuxtesting.org). > > Signed-off-by: Evgeny Novikov <novikov@ispras.ru> Applied. Thanks, Guenter > --- > drivers/hwmon/aspeed-pwm-tacho.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c > index 33fb54845bf6..3d8239fd66ed 100644 > --- a/drivers/hwmon/aspeed-pwm-tacho.c > +++ b/drivers/hwmon/aspeed-pwm-tacho.c > @@ -851,6 +851,8 @@ static int aspeed_create_fan(struct device *dev, > ret = of_property_read_u32(child, "reg", &pwm_port); > if (ret) > return ret; > + if (pwm_port >= ARRAY_SIZE(pwm_port_params)) > + return -EINVAL; > aspeed_create_pwm_port(priv, (u8)pwm_port); > > ret = of_property_count_u8_elems(child, "cooling-levels");
diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c index 33fb54845bf6..3d8239fd66ed 100644 --- a/drivers/hwmon/aspeed-pwm-tacho.c +++ b/drivers/hwmon/aspeed-pwm-tacho.c @@ -851,6 +851,8 @@ static int aspeed_create_fan(struct device *dev, ret = of_property_read_u32(child, "reg", &pwm_port); if (ret) return ret; + if (pwm_port >= ARRAY_SIZE(pwm_port_params)) + return -EINVAL; aspeed_create_pwm_port(priv, (u8)pwm_port); ret = of_property_count_u8_elems(child, "cooling-levels");
aspeed_create_fan() reads a pwm_port value using of_property_read_u32(). If pwm_port will be more than ARRAY_SIZE(pwm_port_params), there will be a buffer overflow in aspeed_create_pwm_port()->aspeed_set_pwm_port_enable(). The patch fixes the potential buffer overflow. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Evgeny Novikov <novikov@ispras.ru> --- drivers/hwmon/aspeed-pwm-tacho.c | 2 ++ 1 file changed, 2 insertions(+)