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* [PATCH] hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow
@ 2020-07-03 11:15 ` Evgeny Novikov
  0 siblings, 0 replies; 4+ messages in thread
From: Evgeny Novikov @ 2020-07-03 11:15 UTC (permalink / raw)
  To: Jean Delvare
  Cc: Evgeny Novikov, Guenter Roeck, Joel Stanley, Andrew Jeffery,
	linux-hwmon, linux-arm-kernel, linux-aspeed, linux-kernel,
	ldv-project

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(+)

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");
-- 
2.16.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2020-07-03 22:19 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-03 11:15 [PATCH] hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow Evgeny Novikov
2020-07-03 11:15 ` Evgeny Novikov
2020-07-03 22:17 ` Guenter Roeck
2020-07-03 22:17   ` Guenter Roeck

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