linux-kernel - Re: [syzbot] [sound?] KMSAN: uninit-value in line6_midibuf

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Message-ID: <tencent_1C33839ECE1B1A4BC11B35251ABA11BBAC08@qq.com>
Date: Wed, 24 Jul 2024 08:56:16 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+78eccfb8b3c9a85fc6c5@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] KMSAN: uninit-value in line6_midibuf_read

when alloc buffer for midi_buffer->buf, init mem to 0

#syz test: upstream 2c9b3512402e

diff --git a/sound/usb/line6/midibuf.c b/sound/usb/line6/midibuf.c
index e7f830f7526c..1b699cb3b38d 100644
--- a/sound/usb/line6/midibuf.c
+++ b/sound/usb/line6/midibuf.c
@@ -48,7 +48,7 @@ void line6_midibuf_reset(struct midi_buffer *this)
 
 int line6_midibuf_init(struct midi_buffer *this, int size, int split)
 {
-	this->buf = kmalloc(size, GFP_KERNEL);
+	this->buf = kzalloc(size, GFP_KERNEL);
 
 	if (this->buf == NULL)
 		return -ENOMEM;