Re: [PATCH 2/3] staging: r8188eu: refactor rtw_ch2freq()

[Michael Straube <straube.linux@xxxxxxxxx>]

On 2/20/22 17:20, Pavel Skripkin wrote:
> Hi Michael,
>
> On 2/20/22 18:48, Michael Straube wrote:
> > -static int ch_freq_map_num = ARRAY_SIZE(ch_freq_map);
> > -
> >   u32 rtw_ch2freq(u32 channel)
> >   {
> > -    u8    i;
> > -    u32    freq = 0;
> > -
> > -    for (i = 0; i < ch_freq_map_num; i++) {
> > -        if (channel == ch_freq_map[i].channel) {
> > -            freq = ch_freq_map[i].frequency;
> > -                break;
> > -        }
> > -    }
> > -    if (i == ch_freq_map_num)
> > -        freq = 2412;
> > -
> > -    return freq;
> > +    return ch_freq_map[channel - 1];
> >   }
>
> What if channel has wrong value? The old code returned some default 
> value, but with new one we will hit OOB.

Hi Pavel,

thanks for reviewing. Yeah, I thought about adding a check for channel
value between 1 and 14. But I did not add it because I think if this
function will ever be called with channel < 1 or channel > 14, then the
calling code must be wrong.

Would be nice to see what others think about this.

Thanks,
Michael