linux-kernel - Re: [PATCH 1/3] auxdisplay: charlcd: fix hex literal ranges for graphics command

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Message-ID: <CANiq72m6bFYywFa30HhtiAxPP0sK+bWgsxwUhT+b-Sjh0baBCA@mail.gmail.com>
Date:   Sat, 10 Feb 2018 10:41:34 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Willy Tarreau <w@....eu>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Robert Abel <rabel@...ertabel.eu>
Subject: Re: [PATCH 1/3] auxdisplay: charlcd: fix hex literal ranges for
 graphics command

On Sat, Feb 10, 2018 at 10:20 AM, Willy Tarreau <w@....eu> wrote:
> Hi Miguel,
>
> On Sat, Feb 10, 2018 at 09:58:44AM +0100, Miguel Ojeda wrote:
>> On Sat, Feb 10, 2018 at 12:50 AM, Robert Abel <rabel@...ertabel.eu> wrote:
>> > The graphics command expects 16 hexadecimal literals, but would allow characters in range [0-9a-zA-Z] instead of [0-9a-fA-F].
>> >
>> > Signed-off-by: Robert Abel <rabel@...ertabel.eu>
>> > ---
>> >  drivers/auxdisplay/charlcd.c | 4 ++--
>> >  1 file changed, 2 insertions(+), 2 deletions(-)
>> >
>> > diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
>> > index 642afd88870b..324d02f9f1c5 100644
>> > --- a/drivers/auxdisplay/charlcd.c
>> > +++ b/drivers/auxdisplay/charlcd.c
>> > @@ -441,9 +441,9 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
>> >                         shift ^= 4;
>> >                         if (*esc >= '0' && *esc <= '9') {
>> >                                 value |= (*esc - '0') << shift;
>> > -                       } else if (*esc >= 'A' && *esc <= 'Z') {
>> > +                       } else if (*esc >= 'A' && *esc <= 'F') {
>> >                                 value |= (*esc - 'A' + 10) << shift;
>> > -                       } else if (*esc >= 'a' && *esc <= 'z') {
>> > +                       } else if (*esc >= 'a' && *esc <= 'f') {
>>
>> Willy, Geert: this seems obvious, but do you know if the broader range
>> was intended for some reason?
>
> No, I think it was simply a brain fart from me 14 years ago, as I can
> find it as well in the original 0.9.0 patch for kernel 2.4!
>
> Ack from me on this patch.

Thanks Willy for the quick answer! Then:

Compile-tested.

Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>

>
> Willy