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    Subject[009/105] sound/oss/opl3: validate voice and channel indexes
    2.6.38-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Dan Rosenberg <drosenberg@vsecurity.com>

    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>

    ---
    sound/oss/opl3.c | 15 +++++++++++++--
    1 file changed, 13 insertions(+), 2 deletions(-)

    --- a/sound/oss/opl3.c
    +++ b/sound/oss/opl3.c
    @@ -849,6 +849,10 @@ static int opl3_load_patch(int dev, int

    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

    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);




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