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Quentin Casasnovas fd1d957101 cdc-acm: prevent infinite loop when parsing CDC headers. ... commit 0d3bba0287 upstream. Phil and I found out a problem with commit: 7e860a6e7a ("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: 7e860a6e7a ("cdc-acm: add sanity checks") Signed-off-by: Phil Turnbull <phil.turnbull@oracle.com> Signed-off-by: Quentin Casasnovas <quentin.casasnovas@oracle.com> CC: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> CC: Oliver Neukum <oneukum@suse.de> CC: Adam Lee <adam8157@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>		History 2015-05-12 09:36:38 +01:00
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cdc-acm.c	cdc-acm: prevent infinite loop when parsing CDC headers.	2015-05-12 09:36:38 +01:00
cdc-acm.h	USB: cdc-acm: add quirk for control-line state requests	2014-11-14 15:20:01 +00:00
cdc-wdm.c	cdc-wdm: fix endianness bug in debug statements	2015-05-05 11:09:34 +01:00
Kconfig	USB: regroup all depends on USB within an if USB block	2013-04-09 16:49:07 -07:00
Makefile	USB: add USB test and measurement class driver	2008-10-17 14:40:51 -07:00
usblp.c	usb: delete non-required instances of include <linux/init.h>	2014-01-08 15:01:39 -08:00
usbtmc.c	USB: usbtmc: fix DMA on stack	2014-05-27 16:03:57 -07:00