media: ttusb-dec: Fix info-leak in ttusb_dec_send_command()

commit a10feaf8c464c3f9cfdd3a8a7ce17e1c0d498da1 upstream.

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: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/media/usb/ttusb-dec/ttusb_dec.c b/drivers/media/usb/ttusb-dec/ttusb_dec.c
index 29724af9b9ab11fbb36c1871bacada0fde62409c..ab0098ce4bbb0ae6ab6733e91b97ec2b9837fc8f 100644 (file)
--- a/drivers/media/usb/ttusb-dec/ttusb_dec.c
+++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c
@@ -272,7 +272,7 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
 
        dprintk("%s\n", __func__);
 
-       b = kmalloc(COMMAND_PACKET_SIZE + 4, GFP_KERNEL);
+       b = kzalloc(COMMAND_PACKET_SIZE + 4, GFP_KERNEL);
        if (!b)
                return -ENOMEM;