diff options
| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2016-06-02 16:00:09 -0400 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-06-08 10:08:12 +0200 |
| commit | d15d6cf91695674fbabac3b1d2c8a269d9bab5c6 (patch) | |
| tree | 292389e5b2bc098989c727326858132af43450b0 | |
| parent | af8c34ce6ae32addda3788d54a7e340cad22516b (diff) | |
| download | lwn-d15d6cf91695674fbabac3b1d2c8a269d9bab5c6.tar.gz lwn-d15d6cf91695674fbabac3b1d2c8a269d9bab5c6.zip | |
gpio: 104-dio-48e: Fix control port offset computation off-by-one error
There are only two control ports, each controlling three distinct I/O
ports. To compute the control port address offset for a respective I/O
port, the I/O port address offset should be divided by 3; dividing by 2
may result in not only the wrong address offset but possibly also an
out-of-bounds array memory access for a non-existent third control port.
Fixes: 1b06d64f7374 ("gpio: Add GPIO support for the ACCES 104-DIO-48E")
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-104-dio-48e.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c index 1a647c07be67..fcf776971ca9 100644 --- a/drivers/gpio/gpio-104-dio-48e.c +++ b/drivers/gpio/gpio-104-dio-48e.c @@ -75,7 +75,7 @@ static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); const unsigned io_port = offset / 8; - const unsigned control_port = io_port / 2; + const unsigned int control_port = io_port / 3; const unsigned control_addr = dio48egpio->base + 3 + control_port*4; unsigned long flags; unsigned control; @@ -115,7 +115,7 @@ static int dio48e_gpio_direction_output(struct gpio_chip *chip, unsigned offset, { struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip); const unsigned io_port = offset / 8; - const unsigned control_port = io_port / 2; + const unsigned int control_port = io_port / 3; const unsigned mask = BIT(offset % 8); const unsigned control_addr = dio48egpio->base + 3 + control_port*4; const unsigned out_port = (io_port > 2) ? io_port + 1 : io_port; |