ALSA: cs423x: fix format string overflow warning

The snd_pcm name may overflow the card->longname total size:

sound/isa/cs423x/cs4231.c: In function 'snd_cs4231_probe':
sound/isa/cs423x/cs4231.c:115:26: error: ' at 0x' directive writing 6 bytes into a region of size between 1 and 80 [-Werror=format-overflow=] 0x%lx, irq %d, dma %d",
  sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This changes the driver to use snprintf() so we truncate the string
instead of overflowing into the next field if that happens.

I decided to split out the second format string for the extra
DMA channel to keep the code simpler.

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

2 files changed, 22 insertions, 16 deletions

diff --git a/sound/isa/cs423x/cs4231.c b/sound/isa/cs423x/cs4231.c
index e8edd9017a2f..d90ab9558f7f 100644
--- a/sound/isa/cs423x/cs4231.c
+++ b/sound/isa/cs423x/cs4231.c
@@ -109,13 +109,17 @@ static int snd_cs4231_probe(struct device *dev, unsigned int n)
         if (error < 0)
                 goto out;
 
-        strcpy(card->driver, "CS4231");
-        strcpy(card->shortname, chip->pcm->name);
-
-        sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d",
-                chip->pcm->name, chip->port, irq[n], dma1[n]);
-        if (dma2[n] >= 0)
-                sprintf(card->longname + strlen(card->longname), "&%d", dma2[n]);
+        strlcpy(card->driver, "CS4231", sizeof(card->driver));
+        strlcpy(card->shortname, chip->pcm->name, sizeof(card->shortname));
+
+        if (dma2[n] < 0)
+                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&%d",
+                         chip->pcm->name, chip->port, irq[n], dma1[n], dma2[n]);
 
         error = snd_wss_mixer(chip);
         if (error < 0)
diff --git a/sound/isa/cs423x/cs4236.c b/sound/isa/cs423x/cs4236.c
index 1f9a3b2be7a1..4c09756c7353 100644
--- a/sound/isa/cs423x/cs4236.c
+++ b/sound/isa/cs423x/cs4236.c
@@ -419,15 +419,17 @@ static int snd_cs423x_probe(struct snd_card *card, int dev)
                 if (err < 0)
                         return err;
         }
-        strcpy(card->driver, chip->pcm->name);
-        strcpy(card->shortname, chip->pcm->name);
-        sprintf(card->longname, "%s at 0x%lx, irq %i, dma %i",
-                chip->pcm->name,
-                chip->port,
-                irq[dev],
-                dma1[dev]);
-        if (dma2[dev] >= 0)
-                sprintf(card->longname + strlen(card->longname), "&%d", dma2[dev]);
+        strlcpy(card->driver, chip->pcm->name, sizeof(card->driver));
+        strlcpy(card->shortname, chip->pcm->name, sizeof(card->shortname));
+        if (dma2[dev] < 0)
+                snprintf(card->longname, sizeof(card->longname),
+                         "%s at 0x%lx, irq %i, dma %i",
+                         chip->pcm->name, chip->port, irq[dev], dma1[dev]);
+        else
+                snprintf(card->longname, sizeof(card->longname),
+                         "%s at 0x%lx, irq %i, dma %i&%d",
+                         chip->pcm->name, chip->port, irq[dev], dma1[dev],
+                         dma2[dev]);
 
         err = snd_wss_timer(chip, 0);
         if (err < 0)