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authorDan Carpenter <dan.carpenter@oracle.com>2015-03-23 12:41:31 +0300
committerTakashi Iwai <tiwai@suse.de>2015-03-23 14:00:28 +0100
commit77008b70fe0a9ffe354580d9dfda329cdde7f20b (patch)
treeabf0888bcd55c82a26218df1596cf674e51e4515
parentALSA: ak411x: simplify snd_ak4113_create() a bit (diff)
downloadlinux-dev-77008b70fe0a9ffe354580d9dfda329cdde7f20b.tar.xz
linux-dev-77008b70fe0a9ffe354580d9dfda329cdde7f20b.zip
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 <dan.carpenter@oracle.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to '')
-rw-r--r--sound/pci/echoaudio/echoaudio.c16
1 files 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;