ALSA: ad1848: fix format string overflow warning

The snd_pcm name is too long to fit into the card shortname
or a part of the longname:

sound/isa/ad1848/ad1848.c: In function 'snd_ad1848_probe':
sound/isa/ad1848/ad1848.c:116:26: error: ' at 0x' directive writing 6 bytes into a region of size between 1 and 80 [-Werror=format-overflow=]
sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound/isa/ad1848/ad1848.c:116:2: note: 'sprintf' output between 22 and 128 bytes into a destination of size 80
sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
chip->pcm->name, chip->port, irq[n], dma1[n]);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This changes the code to use length-checking functions that truncate
if necessary. The "[Thinkpad]" substring is now also part of the
snprintf(), as that could also overflow the buffer.

Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/isa/ad1848/ad1848.c

···
 	if (error < 0)
 		goto out;
 
-	strcpy(card->driver, "AD1848");
-	strcpy(card->shortname, chip->pcm->name);
+	strlcpy(card->driver, "AD1848", sizeof(card->driver));
+	strlcpy(card->shortname, chip->pcm->name, sizeof(card->shortname));
 
-	sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
-		chip->pcm->name, chip->port, irq[n], dma1[n]);
-	if (thinkpad[n])
-		strcat(card->longname, " [Thinkpad]");
+	if (!thinkpad[n])
+		snprintf(card->longname, sizeof(card->longname),
+			 "%s at 0x%lx, irq %d, dma %d",
+			 chip->pcm->name, chip->port, irq[n], dma1[n]);
+	else
+		snprintf(card->longname, sizeof(card->longname),
+			 "%s at 0x%lx, irq %d, dma %d [Thinkpad]",
+			 chip->pcm->name, chip->port, irq[n], dma1[n]);
 
 	error = snd_card_register(card);
 	if (error < 0)