yeahuh / rpms / qemu-kvm

Forked from rpms/qemu-kvm 2 years ago
Clone
958e1b
From b7dd3cebccd2a785e78aca482f336d0e1500cfc5 Mon Sep 17 00:00:00 2001
eb5a2f
From: Michael S. Tsirkin <mst@redhat.com>
958e1b
Date: Thu, 15 May 2014 09:52:56 +0200
958e1b
Subject: [PATCH 25/31] usb: fix up post load checks
eb5a2f
eb5a2f
RH-Author: Michael S. Tsirkin <mst@redhat.com>
958e1b
Message-id: <1400144784-16355-1-git-send-email-mst@redhat.com>
958e1b
Patchwork-id: 58907
958e1b
O-Subject: [PATCH qemu-kvm RHEL7.1] usb: fix up post load checks
958e1b
Bugzilla: 1096829
eb5a2f
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
eb5a2f
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
eb5a2f
RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
eb5a2f
RH-Acked-by: Juan Quintela <quintela@redhat.com>
eb5a2f
eb5a2f
Correct post load checks:
eb5a2f
1. dev->setup_len == sizeof(dev->data_buf)
eb5a2f
    seems fine, no need to fail migration
eb5a2f
2. When state is DATA, passing index > len
eb5a2f
   will cause memcpy with negative length,
eb5a2f
   resulting in heap overflow
eb5a2f
eb5a2f
First of the issues was reported by dgilbert.
eb5a2f
eb5a2f
Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
eb5a2f
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
eb5a2f
Signed-off-by: Juan Quintela <quintela@redhat.com>
eb5a2f
(cherry picked from commit 719ffe1f5f72b1c7ace4afe9ba2815bcb53a829e)
eb5a2f
Note: in maintainer's tree
eb5a2f
 git://github.com/juanquintela/qemu.git tags/migration/20140515,
eb5a2f
 pull request sent
eb5a2f
eb5a2f
CVE-2014-3461
eb5a2f
958e1b
Bugzilla: 1096829
958e1b
Brew build: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=7459730
eb5a2f
Tested: lightly on developer's box
eb5a2f
---
eb5a2f
 hw/usb/bus.c | 4 ++--
eb5a2f
 1 file changed, 2 insertions(+), 2 deletions(-)
eb5a2f
eb5a2f
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
eb5a2f
---
eb5a2f
 hw/usb/bus.c |    4 ++--
eb5a2f
 1 files changed, 2 insertions(+), 2 deletions(-)
eb5a2f
eb5a2f
diff --git a/hw/usb/bus.c b/hw/usb/bus.c
eb5a2f
index 9766b7f..f4eeb5e 100644
eb5a2f
--- a/hw/usb/bus.c
eb5a2f
+++ b/hw/usb/bus.c
eb5a2f
@@ -51,8 +51,8 @@ static int usb_device_post_load(void *opaque, int version_id)
eb5a2f
     }
eb5a2f
     if (dev->setup_index < 0 ||
eb5a2f
         dev->setup_len < 0 ||
eb5a2f
-        dev->setup_index >= sizeof(dev->data_buf) ||
eb5a2f
-        dev->setup_len >= sizeof(dev->data_buf)) {
eb5a2f
+        dev->setup_index > dev->setup_len ||
eb5a2f
+        dev->setup_len > sizeof(dev->data_buf)) {
eb5a2f
         return -EINVAL;
eb5a2f
     }
eb5a2f
     return 0;
eb5a2f
-- 
eb5a2f
1.7.1
eb5a2f