| Message ID | 20240830180516.2103062-1-peter.maydell@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | hw/gpio/aspeed_gpio: Avoid shift into sign bit | expand |
On 8/30/24 20:05, Peter Maydell wrote: > In aspeed_gpio_update() we calculate "mask = 1 << gpio", where > gpio can be between 0 and 31. Coverity complains about this > because 1 << 31 won't fit in a signed integer. > > For QEMU this isn't an error because we enable -fwrapv, > but we can keep Coverity happy by doing the shift on > unsigned numbers. > > Resolves: Coverity CID 1547742 > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Cédric Le Goater <clg@redhat.com> Applied to aspeed-next. Thanks, C.
diff --git a/hw/gpio/aspeed_gpio.c b/hw/gpio/aspeed_gpio.c index 6474bb8de5b..d6ccf63a2ff 100644 --- a/hw/gpio/aspeed_gpio.c +++ b/hw/gpio/aspeed_gpio.c @@ -281,7 +281,7 @@ static void aspeed_gpio_update(AspeedGPIOState *s, GPIOSets *regs, diff &= mode_mask; if (diff) { for (gpio = 0; gpio < ASPEED_GPIOS_PER_SET; gpio++) { - uint32_t mask = 1 << gpio; + uint32_t mask = 1U << gpio; /* If the gpio needs to be updated... */ if (!(diff & mask)) {
In aspeed_gpio_update() we calculate "mask = 1 << gpio", where gpio can be between 0 and 31. Coverity complains about this because 1 << 31 won't fit in a signed integer. For QEMU this isn't an error because we enable -fwrapv, but we can keep Coverity happy by doing the shift on unsigned numbers. Resolves: Coverity CID 1547742 Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- Very minor but I'm just fixing a few easy issues on a Friday evening :-) hw/gpio/aspeed_gpio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)