[ALSA] ac97 - Fix potential negative array index

Fix the case cidx2 >= 0 and cidx2 < 0 which may result in negative
array index.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/pci/ac97/ac97_patch.c b/sound/pci/ac97/ac97_patch.c
index f63025e99ab6..e813968e0cf8 100644
--- a/sound/pci/ac97/ac97_patch.c
+++ b/sound/pci/ac97/ac97_patch.c
@@ -1467,7 +1467,9 @@ static void patch_ad1881_chained(struct snd_ac97 * ac97, int unchained_idx, int
         snd_ac97_write_cache(ac97, AC97_AD_CODEC_CFG, 0x0002);          // ID1C
         ac97->spec.ad18xx.codec_cfg[unchained_idx] = 0x0002;
         if (cidx1 >= 0) {
-                if (patch_ad1881_chained1(ac97, cidx1, 0x0006))         // SDIE | ID1C
+                if (cidx2 < 0)
+                        patch_ad1881_chained1(ac97, cidx1, 0);
+                else if (patch_ad1881_chained1(ac97, cidx1, 0x0006))    // SDIE | ID1C
                         patch_ad1881_chained1(ac97, cidx2, 0);
                 else if (patch_ad1881_chained1(ac97, cidx2, 0x0006))    // SDIE | ID1C
                         patch_ad1881_chained1(ac97, cidx1, 0);