linux-kernel - [PATCH 3.2 059/164] cdc-acm: prevent infinite loop when parsing CDC headers.

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Message-ID: <lsq.1438473757.401068337@decadent.org.uk>
Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Quentin Casasnovas" <quentin.casasnovas@...cle.com>,
	"Adam Lee" <adam8157@...il.com>,
	"Phil Turnbull" <phil.turnbull@...cle.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	"Sergei Shtylyov" <sergei.shtylyov@...entembedded.com>,
	"Oliver Neukum" <oneukum@...e.de>
Subject: [PATCH 3.2 059/164] cdc-acm: prevent infinite loop when parsing
 CDC headers.

3.2.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Quentin Casasnovas <quentin.casasnovas@...cle.com>

commit 0d3bba0287d4e284c3ec7d3397e81eec920d5e7e upstream.

Phil and I found out a problem with commit:

  7e860a6e7aa6 ("cdc-acm: add sanity checks")

It added some sanity checks to ignore potential garbage in CDC headers but
also introduced a potential infinite loop.  This can happen at the first
loop iteration (elength = 0 in that case) if the description isn't a
DT_CS_INTERFACE or later if 'buffer[0]' is zero.

It should also be noted that the wrong length was being added to 'buffer'
in case 'buffer[1]' was not a DT_CS_INTERFACE descriptor, since elength was
assigned after that check in the loop.

A specially crafted USB device could be used to trigger this infinite loop.

Fixes: 7e860a6e7aa6 ("cdc-acm: add sanity checks")
Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
Signed-off-by: Quentin Casasnovas <quentin.casasnovas@...cle.com>
CC: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC: Oliver Neukum <oneukum@...e.de>
CC: Adam Lee <adam8157@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/class/cdc-acm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -947,11 +947,16 @@ static int acm_probe(struct usb_interfac
 	}
 
 	while (buflen > 0) {
+		elength = buffer[0];
+		if (!elength) {
+			dev_err(&intf->dev, "skipping garbage byte\n");
+			elength = 1;
+			goto next_desc;
+		}
 		if (buffer[1] != USB_DT_CS_INTERFACE) {
 			dev_err(&intf->dev, "skipping garbage\n");
 			goto next_desc;
 		}
-		elength = buffer[0];
 
 		switch (buffer[2]) {
 		case USB_CDC_UNION_TYPE: /* we've found it */

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