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

[ Upstream commit a10feaf8c464c3f9cfdd3a8a7ce17e1c0d498da1 ]

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: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/usb/ttusb-dec/ttusb_dec.c b/drivers/media/usb/ttusb-dec/ttusb_dec.c
index 4e7671a3a1e4a2408c02d1e0a8c3d57038a60571..d7397c0d7f8690b6ab29a7bd341d0f7eed68f3cf 100644 (file)
--- a/drivers/media/usb/ttusb-dec/ttusb_dec.c
+++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c
@@ -278,7 +278,7 @@ 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;