ALSA: hda/realtek - Fix overflow of vol/sw check bitmap

The bitmap introduced in the commit [527e4d73: ALSA: hda/realtek - Fix
missing volume controls with ALC260] is too narrow for some codecs,
which may have more NIDs than 0x20, thus it may overflow the bitmap
array on them.

Just double the number to cover all and also add a sanity-check code
to be safer.

Cc: <stable@kernel.org> [v3.2+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 1358987c49d8ccf12367687608a63051a8bdc50e..389a28a21fa95a3c94dc67743bbbab3aa111989a 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -80,6 +80,8 @@ enum {
        ALC_AUTOMUTE_MIXER,     /* mute/unmute mixer widget AMP */
 };
 
+#define MAX_VOL_NIDS   0x40
+
 struct alc_spec {
        /* codec parameterization */
        const struct snd_kcontrol_new *mixers[5];       /* mixer arrays */
@@ -118,8 +120,8 @@ struct alc_spec {
        const hda_nid_t *capsrc_nids;
        hda_nid_t dig_in_nid;           /* digital-in NID; optional */
        hda_nid_t mixer_nid;            /* analog-mixer NID */
-       DECLARE_BITMAP(vol_ctls, 0x20 << 1);
-       DECLARE_BITMAP(sw_ctls, 0x20 << 1);
+       DECLARE_BITMAP(vol_ctls, MAX_VOL_NIDS << 1);
+       DECLARE_BITMAP(sw_ctls, MAX_VOL_NIDS << 1);
 
        /* capture setup for dynamic dual-adc switch */
        hda_nid_t cur_adc;
@@ -3149,7 +3151,10 @@ static int alc_auto_fill_dac_nids(struct hda_codec *codec)
 static inline unsigned int get_ctl_pos(unsigned int data)
 {
        hda_nid_t nid = get_amp_nid_(data);
-       unsigned int dir = get_amp_direction_(data);
+       unsigned int dir;
+       if (snd_BUG_ON(nid >= MAX_VOL_NIDS))
+               return 0;
+       dir = get_amp_direction_(data);
        return (nid << 1) | dir;
 }