From 821117dc21083a99dd99174c10848d70ff43de29 Mon Sep 17 00:00:00 2001 From: Alyssa Milburn Date: Sat, 1 Apr 2017 14:33:42 -0300 Subject: [PATCH] [media] digitv: limit messages to buffer size Return an error rather than memcpy()ing beyond the end of the buffer. Internal callers use appropriate sizes, but digitv_i2c_xfer may not. Signed-off-by: Alyssa Milburn Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/dvb-usb/digitv.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/media/usb/dvb-usb/digitv.c b/drivers/media/usb/dvb-usb/digitv.c index 4284f6984dc1..475a3c0cdee7 100644 --- a/drivers/media/usb/dvb-usb/digitv.c +++ b/drivers/media/usb/dvb-usb/digitv.c @@ -33,6 +33,9 @@ static int digitv_ctrl_msg(struct dvb_usb_device *d, wo = (rbuf == NULL || rlen == 0); /* write-only */ + if (wlen > 4 || rlen > 4) + return -EIO; + memset(st->sndbuf, 0, 7); memset(st->rcvbuf, 0, 7); -- 2.45.2