On 12 May 2015 at 14:14, Cornelia Huck <cornelia.huck@xxxxxxxxxx> wrote:
> On Wed, 06 May 2015 14:07:37 +0200
> Greg Kurz <gkurz@xxxxxxxxxxxxxxxxxx> wrote:
>> @@ -233,7 +233,6 @@ static inline void virtio_clear_feature(uint32_t *features, unsigned int fbit)
>>
>> static inline bool __virtio_has_feature(uint32_t features, unsigned int fbit)
>> {
>> - assert(fbit < 32);
>> return !!(features & (1 << fbit));
>> }
>>
>>
>>
>
> I must say I'm not very comfortable with knowingly passing out-of-rage
> values to this function.
It would invoke C undefined behaviour, so clearly a bug if we did
pass an out-of-range value here. You'd need to at least do
if (fbit >= 32) {
return false;
}
if you want to make it valid.
-- PMM
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
