ALSA: opti9xx: fix format string overflow warning

We pass a long name from "codec->pcm->name" into the longname
string of the same length:

sound/isa/opti9xx/miro.c: In function 'snd_miro_probe':
sound/isa/opti9xx/miro.c:1356:39: error: '%s' directive writing up to 79 bytes into a region of size between 35 and 72 [-Werror=format-overflow=]
  sprintf(card->longname, "%s: OPTi%s, %s at 0x%lx, irq %d, dma %d&%d",
                                       ^~
sound/isa/opti9xx/miro.c:1356:26: note: using the range [0, 4294967295] for directive argument
  sprintf(card->longname, "%s: OPTi%s, %s at 0x%lx, irq %d, dma %d&%d",
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound/isa/opti9xx/miro.c:1356:2: note: 'sprintf' output between 32 and 185 bytes into a destination of size 80
  sprintf(card->longname, "%s: OPTi%s, %s at 0x%lx, irq %d, dma %d&%d",

There is no easy way to avoid the theoretical overflow in this case,
but using snprintf() will turn it into a harmless truncation.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/opti9xx/miro.c

@@ -1353,9 +1353,10 @@ static int snd_miro_probe(struct snd_card *card)
 	}
 
 	strcpy(card->driver, "miro");
-	sprintf(card->longname, "%s: OPTi%s, %s at 0x%lx, irq %d, dma %d&%d",
-		card->shortname, miro->name, codec->pcm->name,
-		miro->wss_base + 4, miro->irq, miro->dma1, miro->dma2);
+	snprintf(card->longname, sizeof(card->longname),
+		 "%s: OPTi%s, %s at 0x%lx, irq %d, dma %d&%d",
+		 card->shortname, miro->name, codec->pcm->name,
+		 miro->wss_base + 4, miro->irq, miro->dma1, miro->dma2);
 
 	if (mpu_port <= 0 || mpu_port == SNDRV_AUTO_PORT)
 		rmidi = NULL;

sound/isa/opti9xx/opti92x-ad1848.c

@@ -879,13 +879,15 @@ static int snd_opti9xx_probe(struct snd_card *card)
 	strcpy(card->driver, chip->name);
 	sprintf(card->shortname, "OPTi %s", card->driver);
 #if defined(CS4231) || defined(OPTi93X)
-	sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d&%d",
-		card->shortname, codec->pcm->name,
-		chip->wss_base + 4, irq, dma1, xdma2);
+	snprintf(card->longname, sizeof(card->longname),
+		 "%s, %s at 0x%lx, irq %d, dma %d&%d",
+		 card->shortname, codec->pcm->name,
+		 chip->wss_base + 4, irq, dma1, xdma2);
 #else
-	sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d",
-		card->shortname, codec->pcm->name, chip->wss_base + 4, irq,
-		dma1);
+	snprintf(card->longname, sizeof(card->longname),
+		 "%s, %s at 0x%lx, irq %d, dma %d",
+		 card->shortname, codec->pcm->name, chip->wss_base + 4, irq,
+		 dma1);
 #endif	/* CS4231 || OPTi93X */
 
 	if (mpu_port <= 0 || mpu_port == SNDRV_AUTO_PORT)