diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2011-03-23 11:42:57 -0400 |
|---|---|---|
| committer | AK <andi@firstfloor.org> | 2011-03-31 11:58:49 -0700 |
| commit | 8c389a3b0274f3bf86724d2776973071ac86dbdb (patch) | |
| tree | f441be619718d6067644e9861d5232202d4039a9 /sound | |
| parent | d6b391f4879ddcc92f3f46dca793aaaa2cb1a84e (diff) | |
sound/oss/opl3: validate voice and channel indexes
commit 4d00135a680727f6c3be78f8befaac009030e4df upstream.
User-controllable indexes for voice and channel values may cause reading
and writing beyond the bounds of their respective arrays, leading to
potentially exploitable memory corruption. Validate these indexes.
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/oss/opl3.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/sound/oss/opl3.c b/sound/oss/opl3.c index 938c48c4358..f4ffdff9b24 100644 --- a/sound/oss/opl3.c +++ b/sound/oss/opl3.c @@ -849,6 +849,10 @@ static int opl3_load_patch(int dev, int format, const char __user *addr, static void opl3_panning(int dev, int voice, int value) { + + if (voice < 0 || voice >= devc->nr_voice) + return; + devc->voc[voice].panning = value; } @@ -1066,8 +1070,15 @@ static int opl3_alloc_voice(int dev, int chn, int note, struct voice_alloc_info static void opl3_setup_voice(int dev, int voice, int chn) { - struct channel_info *info = - &synth_devs[dev]->chn_info[chn]; + struct channel_info *info; + + if (voice < 0 || voice >= devc->nr_voice) + return; + + if (chn < 0 || chn > 15) + return; + + info = &synth_devs[dev]->chn_info[chn]; opl3_set_instr(dev, voice, info->pgm_num); |