Patch "[media] digitv: limit messages to buffer size" has been added to the 4.11-stable tree

Patch "[media] digitv: limit messages to buffer size" has been added to the 4.11-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    [media] digitv: limit messages to buffer size

to the 4.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     digitv-limit-messages-to-buffer-size.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 821117dc21083a99dd99174c10848d70ff43de29 Mon Sep 17 00:00:00 2001
From: Alyssa Milburn <amilburn@zall.org>
Date: Sat, 1 Apr 2017 14:33:42 -0300
Subject: [media] digitv: limit messages to buffer size

From: Alyssa Milburn <amilburn@zall.org>

commit 821117dc21083a99dd99174c10848d70ff43de29 upstream.

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 <amilburn@zall.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/usb/dvb-usb/digitv.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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_us
 
 	wo = (rbuf == NULL || rlen == 0); /* write-only */
 
+	if (wlen > 4 || rlen > 4)
+		return -EIO;
+
 	memset(st->sndbuf, 0, 7);
 	memset(st->rcvbuf, 0, 7);
 


Patches currently in stable-queue which might be from amilburn@zall.org are

queue-4.11/digitv-limit-messages-to-buffer-size.patch
queue-4.11/ttusb2-limit-messages-to-buffer-size.patch
queue-4.11/zr364xx-enforce-minimum-size-when-reading-header.patch
queue-4.11/dw2102-limit-messages-to-buffer-size.patch