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ALSA: opl3: Fix possible negative array index access

Spotted by coverity CID 115196.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Takashi Iwai 11 年之前
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共有 1 个文件被更改,包括 5 次插入0 次删除
  1. 5 0
      sound/drivers/opl3/opl3_midi.c

+ 5 - 0
sound/drivers/opl3/opl3_midi.c

@@ -390,6 +390,11 @@ void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
 		voice = snd_opl3_oss_map[chan->number];		
 	}
 
+	if (voice < 0) {
+		spin_unlock_irqrestore(&opl3->voice_lock, flags);
+		return;
+	}
+
 	if (voice < MAX_OPL2_VOICES) {
 		/* Left register block for voices 0 .. 8 */
 		reg_side = OPL3_LEFT;