[PATCH 4/4] ALSA: line6: Use kzalloc() for PCM buffer allocation

[Takashi Iwai]

LINE6 driver allocates the PCM buffer via kmalloc(), and this might
leave some bytes uninitialized that are out of the actual ring buffer
size, while it's still exposed via mmap.

For avoiding the leak of the uninitialized kernel memory, simply
replace it with kzalloc().

Fixes: 705ececd1c60 ("Staging: add line6 usb driver")
Reported-by: Sashiko <sashiko-bot@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/usb/line6/pcm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c
index f30d82cc0fc1..d17baf7761c6 100644
--- a/sound/usb/line6/pcm.c
+++ b/sound/usb/line6/pcm.c
@@ -155,7 +155,7 @@ static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
 	/* Invoked multiple times in a row so allocate once only */
 	if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
 		pstr->buffer =
-			kmalloc(array3_size(line6pcm->line6->iso_buffers,
+			kzalloc(array3_size(line6pcm->line6->iso_buffers,
 					    LINE6_ISO_PACKETS, pkt_size),
 				GFP_KERNEL);
 		if (!pstr->buffer)
-- 
2.55.0