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| author | Arnd Bergmann <arnd@arndb.de> | 2017-09-06 17:47:45 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-09-19 09:39:10 +0200 |
| commit | e40a3ae1f794a35c4af3746291ed6fedc1fa0f6f (patch) | |
| tree | d2f50a1b41e2fb2dd76faf783a9ee59beb3c558f /drivers/gpio/gpiolib-acpi.c | |
| parent | 311de3ce96f453a5a6edb3066eb6109cc07e81d2 (diff) | |
| download | lwn-e40a3ae1f794a35c4af3746291ed6fedc1fa0f6f.tar.gz lwn-e40a3ae1f794a35c4af3746291ed6fedc1fa0f6f.zip | |
gpio: acpi: work around false-positive -Wstring-overflow warning
gcc-7 notices that the pin_table is an array of 16-bit numbers,
but fails to take the following range check into account:
drivers/gpio/gpiolib-acpi.c: In function 'acpi_gpiochip_request_interrupt':
drivers/gpio/gpiolib-acpi.c:206:24: warning: '%02X' directive writing between 2 and 4 bytes into a region of size 3 [-Wformat-overflow=]
sprintf(ev_name, "_%c%02X",
^~~~
drivers/gpio/gpiolib-acpi.c:206:20: note: directive argument in the range [0, 65535]
sprintf(ev_name, "_%c%02X",
^~~~~~~~~
drivers/gpio/gpiolib-acpi.c:206:3: note: 'sprintf' output between 5 and 7 bytes into a destination of size 5
sprintf(ev_name, "_%c%02X",
^~~~~~~~~~~~~~~~~~~~~~~~~~~
agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pin);
~~~~
As suggested by Andy, this changes the format string to have a fixed length.
Since modifying the range check did not help, I also opened a bug against
gcc, see link below.
Fixes: 0d1c28a449c6 ("gpiolib-acpi: Add ACPI5 event model support to gpio.")
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patchwork.kernel.org/patch/9840801/
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82123
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib-acpi.c')
| -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 4d2113530735..eb4528c87c0b 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -203,7 +203,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares, if (pin <= 255) { char ev_name[5]; - sprintf(ev_name, "_%c%02X", + sprintf(ev_name, "_%c%02hhX", agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', pin); if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) |