From: Evgeny Novikov novikov@ispras.ru
[ Upstream commit bc4071aafcf4d0535ee423b69167696d6c03207d ]
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 Link: https://lore.kernel.org/r/20200703111518.9644-1-novikov@ispras.ru Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- 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 5e449eac788a1..a43fa730a513b 100644 --- a/drivers/hwmon/aspeed-pwm-tacho.c +++ b/drivers/hwmon/aspeed-pwm-tacho.c @@ -880,6 +880,8 @@ 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");