On Fri, 25 Jan 2019 14:41:39 +0100,
Takashi Sakamoto wrote:
>
> On Fri, Jan 25, 2019 at 03:44:18PM +0300, Dan Carpenter wrote:
> > The > should be >= or otherwise we potentially read one element beyond
> > the end of the ff->tx_midi_substreams[] array.
> >
> > Fixes: 73f5537fb209 ("ALSA: fireface: support tx MIDI functionality of Fireface UCX")
> > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > ---
> > sound/firewire/fireface/ff-protocol-latter.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/sound/firewire/fireface/ff-protocol-latter.c b/sound/firewire/fireface/ff-protocol-latter.c
> > index 817af4447349..438aeed9a1ab 100644
> > --- a/sound/firewire/fireface/ff-protocol-latter.c
> > +++ b/sound/firewire/fireface/ff-protocol-latter.c
> > @@ -275,7 +275,7 @@ static void latter_handle_midi_msg(struct snd_ff *ff, unsigned int offset,
> > struct snd_rawmidi_substream *substream;
> > unsigned int len;
> >
> > - if (index > ff->spec->midi_in_ports)
> > + if (index >= ff->spec->midi_in_ports)
> > return;
> >
> > switch (data & 0x0000000f) {
> > --
> > 2.17.1
>
> Indeed. The value of index is picked up from quadlet data transferred by
> device. The range of value is expected to be 0x00 or 0x01, thus this patch is
> correct.
>
> Reviewed-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
Applied now. Thanks.
Takashi
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