* ALSA: emux: Avoid potential array out-of-bound in snd_emux_xg_control()
@ 2023-02-03 6:00 Артемий Карасев
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From: Артемий Карасев @ 2023-02-03 6:00 UTC (permalink / raw)
To: Jaroslav Kysela, Takashi Iwai, alsa-devel, linux-kernel,
lvc-project
In snd_emux_control() method "snd_emux_port" can be passed with
field chset.midi_mode == SNDRV_MIDI_MODE_XG. The "type" can be
MIDI_CTL_PITCHBEND or MIDI_CTL_CHAN_PRESSURE.
It may lead to accessing 'control' array of size 128 with
MIDI_CTL_PITCHBEND (0x80) or MIDI_CTL_CHAN_PRESSURE (0x82) index.
How can we prevent this? Would it be a good solution to place code like this
before call snd_emux_xg_control()?
if (type == MIDI_CTL_PITCHBEND || type == MIDI_CTL_CHAN_PRESSURE){
return;
}
Found by Linux Verification Center (linuxtesting.org) with SVACE.
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2023-02-03 6:00 ALSA: emux: Avoid potential array out-of-bound in snd_emux_xg_control() Артемий Карасев
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