ALSA: info: Avoid leaking kernel memory

Make sure that the allocated buffer for reading the proc file won't
expose the uncleared kernel memory.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/core/info.c

@@ -89,7 +89,7 @@ static int resize_info_buffer(struct snd_info_buffer *buffer,
 	char *nbuf;
 
 	nsize = PAGE_ALIGN(nsize);
-	nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL);
+	nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL | __GFP_ZERO);
 	if (! nbuf)
 		return -ENOMEM;
 
@@ -353,7 +353,7 @@ static int snd_info_entry_open(struct inode *inode, struct file *file)
 				goto __nomem;
 			data->rbuffer = buffer;
 			buffer->len = PAGE_SIZE;
-			buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
+			buffer->buffer = kzalloc(buffer->len, GFP_KERNEL);
 			if (buffer->buffer == NULL)
 				goto __nomem;
 		}