From 77008b70fe0a9ffe354580d9dfda329cdde7f20b Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Mon, 23 Mar 2015 12:41:31 +0300 Subject: [PATCH] ALSA: echoaudio: read past end of array We need to cap "ucontrol->id.index / num_busses_in(chip)" so the we don't read beyond the end of the array. I also adding a check on "in" and changing the type in snd_echo_mixer_put() from short to unsigned int. Those changes are done for symmetry and are cosmetic. Signed-off-by: Dan Carpenter Signed-off-by: Takashi Iwai --- sound/pci/echoaudio/echoaudio.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c index a962de03ebb6..862db9a0b041 100644 --- a/sound/pci/echoaudio/echoaudio.c +++ b/sound/pci/echoaudio/echoaudio.c @@ -1283,12 +1283,14 @@ static int snd_echo_mixer_info(struct snd_kcontrol *kcontrol, static int snd_echo_mixer_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { - struct echoaudio *chip; + struct echoaudio *chip = snd_kcontrol_chip(kcontrol); + unsigned int out = ucontrol->id.index / num_busses_in(chip); + unsigned int in = ucontrol->id.index % num_busses_in(chip); - chip = snd_kcontrol_chip(kcontrol); - ucontrol->value.integer.value[0] = - chip->monitor_gain[ucontrol->id.index / num_busses_in(chip)] - [ucontrol->id.index % num_busses_in(chip)]; + if (out >= ECHO_MAXAUDIOOUTPUTS || in >= ECHO_MAXAUDIOINPUTS) + return -EINVAL; + + ucontrol->value.integer.value[0] = chip->monitor_gain[out][in]; return 0; } @@ -1297,12 +1299,14 @@ static int snd_echo_mixer_put(struct snd_kcontrol *kcontrol, { struct echoaudio *chip; int changed, gain; - short out, in; + unsigned int out, in; changed = 0; chip = snd_kcontrol_chip(kcontrol); out = ucontrol->id.index / num_busses_in(chip); in = ucontrol->id.index % num_busses_in(chip); + if (out >= ECHO_MAXAUDIOOUTPUTS || in >= ECHO_MAXAUDIOINPUTS) + return -EINVAL; gain = ucontrol->value.integer.value[0]; if (gain < ECHOGAIN_MINOUT || gain > ECHOGAIN_MAXOUT) return -EINVAL; -- 2.20.1