net: netdevsim: Use scnprintf() for avoiding potential buffer overflow

Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit.  Fix it by replacing with scnprintf().

Cc: "David S . Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/ipsec.c

@@ -29,7 +29,7 @@ static ssize_t nsim_dbg_netdev_ops_read(struct file *filp,
 		return -ENOMEM;
 
 	p = buf;
-	p += snprintf(p, bufsize - (p - buf),
+	p += scnprintf(p, bufsize - (p - buf),
 		       "SA count=%u tx=%u\n",
 		       ipsec->count, ipsec->tx);
 
@@ -39,15 +39,15 @@ static ssize_t nsim_dbg_netdev_ops_read(struct file *filp,
 		if (!sap->used)
 			continue;
 
-		p += snprintf(p, bufsize - (p - buf),
+		p += scnprintf(p, bufsize - (p - buf),
 			       "sa[%i] %cx ipaddr=0x%08x %08x %08x %08x\n",
 			       i, (sap->rx ? 'r' : 't'), sap->ipaddr[0],
 			       sap->ipaddr[1], sap->ipaddr[2], sap->ipaddr[3]);
-		p += snprintf(p, bufsize - (p - buf),
+		p += scnprintf(p, bufsize - (p - buf),
 			       "sa[%i]    spi=0x%08x proto=0x%x salt=0x%08x crypt=%d\n",
 			       i, be32_to_cpu(sap->xs->id.spi),
 			       sap->xs->id.proto, sap->salt, sap->crypt);
-		p += snprintf(p, bufsize - (p - buf),
+		p += scnprintf(p, bufsize - (p - buf),
 			       "sa[%i]    key=0x%08x %08x %08x %08x\n",
 			       i, sap->key[0], sap->key[1],
 			       sap->key[2], sap->key[3]);