[PATCH 4.19 27/63] ALSA: line6: Zero-initialize message buffers

Greg Kroah-Hartman
2024-05-14T11:40:00Z

From: Takashi Iwai <tiwai@suse.de>

[ Upstream commit c4e51e424e2c772ce1836912a8b0b87cd61bc9d5 ]

For shutting up spurious KMSAN uninit-value warnings, just replace
kmalloc() calls with kzalloc() for the buffers used for
communications. There should be no real issue with the original code,
but it's still better to cover.

Reported-by: syzbot+7fb05ccf7b3d2f9617b3@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/r/00000000000084b18706150bcca5@google.com
Message-ID: <20240402063628.26609-1-tiwai@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/usb/line6/driver.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index 2399d500b8812..8970d4b3b42c3 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -216,7 +216,7 @@ int line6_send_raw_message_async(struct usb_line6 *line6, const char *buffer,
struct urb *urb;

/* create message: */
- msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
+ msg = kzalloc(sizeof(struct message), GFP_ATOMIC);
if (msg == NULL)
return -ENOMEM;

@@ -694,7 +694,7 @@ static int line6_init_cap_control(struct usb_line6 *line6)
int ret;

/* initialize USB buffers: */
- line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
+ line6->buffer_listen = kzalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
if (!line6->buffer_listen)
return -ENOMEM;

@@ -703,7 +703,7 @@ static int line6_init_cap_control(struct usb_line6 *line6)
return -ENOMEM;

if (line6->properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
- line6->buffer_message = kmalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
+ line6->buffer_message = kzalloc(LINE6_MIDI_MESSAGE_MAXLEN, GFP_KERNEL);
if (!line6->buffer_message)
return -ENOMEM;

--
2.43.0