diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2014-04-01 13:03:00 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-04-14 10:22:36 +0200 |
| commit | b5539fa2d59d697b7b8e28b4d08da844ff60f7cf (patch) | |
| tree | 7c78548114e5d19d31b6477f98600d54d5b26177 /drivers/gpio | |
| parent | e9595f84a6273dffc5b75564d9b12a77630c529e (diff) | |
gpio / ACPI: Prevent potential wrap of GPIO value on OpRegion read
Dan Carpenter's static code checker reports:
The patch 473ed7be0da0: "gpio / ACPI: Add support for ACPI GPIO
operation regions" from Mar 14, 2014, leads to the following static
checker warning:
drivers/gpio/gpiolib-acpi.c:454 acpi_gpio_adr_space_handler()
warn: should 'gpiod_get_raw_value(desc) << i' be a 64 bit type?
This is due the fact that *value is of type u64 and gpiod_get_raw_value()
returns int. Since i can be larger than 31, it is possible that the value
returned gets wrapped.
Fix this by casting the return of gpiod_get_raw_value() to u64 first before
shift.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index d5be56fe689..401add28933 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -451,7 +451,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, if (function == ACPI_WRITE) gpiod_set_raw_value(desc, !!((1 << i) & *value)); else - *value |= gpiod_get_raw_value(desc) << i; + *value |= (u64)gpiod_get_raw_value(desc) << i; } out: |