From: Tomas Bortoli <tomasbortoli@gmail.com>
Date: Wed, 31 Jul 2019 12:19:05 -0300
Subject: media: ttusb-dec: Fix info-leak in ttusb_dec_send_command()
Git-commit: a10feaf8c464c3f9cfdd3a8a7ce17e1c0d498da1
Patch-mainline: 5.4-rc1
References: CVE-2019-19533 bsc#1158834 bnc#1151927 5.3.4

The function at issue does not always initialize each byte allocated
for 'b' and can therefore leak uninitialized memory to a USB device in
the call to usb_bulk_msg()

Use kzalloc() instead of kmalloc()

Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com>
Reported-by: syzbot+0522702e9d67142379f1@syzkaller.appspotmail.com
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/media/usb/ttusb-dec/ttusb_dec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/ttusb-dec/ttusb_dec.c
+++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c
@@ -319,7 +319,7 @@ static int ttusb_dec_send_command(struct
 
 	dprintk("%s\n", __func__);
 
-	b = kmalloc(COMMAND_PACKET_SIZE + 4, GFP_KERNEL);
+	b = kzalloc(COMMAND_PACKET_SIZE + 4, GFP_KERNEL);
 	if (!b)
 		return -ENOMEM;