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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2015-03-23 12:41:31 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-03-23 14:00:28 +0100 |
| commit | 77008b70fe0a9ffe354580d9dfda329cdde7f20b (patch) | |
| tree | abf0888bcd55c82a26218df1596cf674e51e4515 /sound/pci/echoaudio/echoaudio.c | |
| parent | 034f90b393a3d5c99654f048c4b22b3d05e3a345 (diff) | |
| download | lwn-77008b70fe0a9ffe354580d9dfda329cdde7f20b.tar.gz lwn-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 'sound/pci/echoaudio/echoaudio.c')
| -rw-r--r-- | sound/pci/echoaudio/echoaudio.c | 16 |
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; |