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