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author | Evgeny Novikov <novikov@ispras.ru> | 2020-07-03 14:15:18 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 11:16:53 +0300 |
commit | 73ebf5be54b108e71ceb18ef46b7d343d8bfb2e6 (patch) | |
tree | df3212b5917a84625953e56e3a6abcefa7ee4b98 | |
parent | 545f4f98e29e2c8346b83c3f42df0a3d907c4df9 (diff) | |
download | linux-73ebf5be54b108e71ceb18ef46b7d343d8bfb2e6.tar.xz |
hwmon: (aspeed-pwm-tacho) Avoid possible buffer overflow
[ 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>
-rw-r--r-- | drivers/hwmon/aspeed-pwm-tacho.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwmon/aspeed-pwm-tacho.c b/drivers/hwmon/aspeed-pwm-tacho.c index 5e449eac788a..a43fa730a513 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"); |