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CVE-2015-7833 usbvision: crash on invalid device descriptors (rhbz 1270158 1270160)

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This commit is contained in:
Josh Boyer 2015-12-01 14:55:42 -05:00
parent 8b6be20d05
commit 45bb62e168
2 changed files with 55 additions and 0 deletions
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6
kernel.spec
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@ -591,6 +591,9 @@ Patch511: RDS-fix-race-condition-when-sending-a-message-on-unb.patch
#rhbz 1282706
Patch512: 0001-cgroup-make-css_set-pin-its-css-s-to-avoid-use-afer-.patch
#CVE-2015-7833 rhbz 1270158 1270160
Patch567: usbvision-fix-crash-on-detecting-device-with-invalid.patch
# END OF PATCH DEFINITIONS
%endif
@ -2034,6 +2037,9 @@ fi
#
#
%changelog
* Tue Dec 01 2015 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2015-7833 usbvision: crash on invalid device descriptors (rhbz 1270158 1270160)
* Tue Dec 01 2015 Laura Abbott <labbott@redhat.com> - 4.4.0-0.rc3.git1.1
- Linux v4.4-rc3-5-g2255702
- Reenable debugging options.

49
usbvision-fix-crash-on-detecting-device-with-invalid.patch Normal file
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@ -0,0 +1,49 @@
From 2ea39fc263c6a7589e15edb7d2d1c89fa569be53 Mon Sep 17 00:00:00 2001
From: Vladis Dronov <vdronov@redhat.com>
Date: Mon, 16 Nov 2015 15:55:11 -0200
Subject: [PATCH] usbvision: fix crash on detecting device with invalid
configuration
The usbvision driver crashes when a specially crafted usb device with invalid
number of interfaces or endpoints is detected. This fix adds checks that the
device has proper configuration expected by the driver.
Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
---
drivers/media/usb/usbvision/usbvision-video.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/usbvision/usbvision-video.c b/drivers/media/usb/usbvision/usbvision-video.c
index b693206f66dd..d1dc1a198e3e 100644
--- a/drivers/media/usb/usbvision/usbvision-video.c
+++ b/drivers/media/usb/usbvision/usbvision-video.c
@@ -1463,9 +1463,23 @@ static int usbvision_probe(struct usb_interface *intf,
if (usbvision_device_data[model].interface >= 0)
interface = &dev->actconfig->interface[usbvision_device_data[model].interface]->altsetting[0];
- else
+ else if (ifnum < dev->actconfig->desc.bNumInterfaces)
interface = &dev->actconfig->interface[ifnum]->altsetting[0];
+ else {
+ dev_err(&intf->dev, "interface %d is invalid, max is %d\n",
+ ifnum, dev->actconfig->desc.bNumInterfaces - 1);
+ ret = -ENODEV;
+ goto err_usb;
+ }
+
+ if (interface->desc.bNumEndpoints < 2) {
+ dev_err(&intf->dev, "interface %d has %d endpoints, but must"
+ " have minimum 2\n", ifnum, interface->desc.bNumEndpoints);
+ ret = -ENODEV;
+ goto err_usb;
+ }
endpoint = &interface->endpoint[1].desc;
+
if (!usb_endpoint_xfer_isoc(endpoint)) {
dev_err(&intf->dev, "%s: interface %d. has non-ISO endpoint!\n",
__func__, ifnum);
--
2.5.0