From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 18 Jul 2017 11:48:04 +0000 (+0200)
Subject: ALSA: als100: fix format string overflow warning
X-Git-Tag: v4.14-rc4~21^2~27^2~162
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8a463639db5781ed52c972db013eba7d834f440d;p=platform%2Fkernel%2Flinux-exynos.git

ALSA: als100: fix format string overflow warning

The compiler sees that the format string might overflow for the longname:

sound/isa/als100.c: In function 'snd_als100_pnp_detect':
sound/isa/als100.c:225:27: error: ', dma ' directive writing 6 bytes into a region of size between 0 and 64 [-Werror=format-overflow=]
   sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d",
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sound/isa/als100.c:225:3: note: 'sprintf' output between 24 and 113 bytes into a destination of size 80
   sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d",

Open-coding "shortname" here gets us below the limit, and using
snprintf() is a good idea too.

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

diff --git a/sound/isa/als100.c b/sound/isa/als100.c
index bc9ea30..6a2c5b4 100644
--- a/sound/isa/als100.c
+++ b/sound/isa/als100.c
@@ -222,15 +222,16 @@ static int snd_card_als100_probe(int dev,
 	if (pid->driver_data == SB_HW_DT019X) {
 		strcpy(card->driver, "DT-019X");
 		strcpy(card->shortname, "Diamond Tech. DT-019X");
-		sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d",
-			card->shortname, chip->name, chip->port,
-			irq[dev], dma8[dev]);
+		snprintf(card->longname, sizeof(card->longname),
+			 "Diamond Tech. DT-019X, %s at 0x%lx, irq %d, dma %d",
+			 chip->name, chip->port, irq[dev], dma8[dev]);
 	} else {
 		strcpy(card->driver, "ALS100");
 		strcpy(card->shortname, "Avance Logic ALS100");
-		sprintf(card->longname, "%s, %s at 0x%lx, irq %d, dma %d&%d",
-			card->shortname, chip->name, chip->port,
-			irq[dev], dma8[dev], dma16[dev]);
+		snprintf(card->longname, sizeof(card->longname),
+			 "Avance Logic ALS100, %s at 0x%lx, irq %d, dma %d&%d",
+			 chip->name, chip->port, irq[dev], dma8[dev],
+			 dma16[dev]);
 	}
 
 	if ((error = snd_sb16dsp_pcm(chip, 0)) < 0) {