41 lines
1.2 KiB
Diff
41 lines
1.2 KiB
Diff
From 9f8e9895c504149d7048e9fc5eb5cbb34b16e49a Mon Sep 17 00:00:00 2001
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Date: Thu, 3 Apr 2014 19:52:25 +0300
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Subject: [PATCH] usb: sanity check setup_index+setup_len in post_load
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CVE-2013-4541
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s->setup_len and s->setup_index are fed into usb_packet_copy as
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size/offset into s->data_buf, it's possible for invalid state to exploit
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this to load arbitrary data.
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setup_len and setup_index should be checked to make sure
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they are not negative.
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Cc: Gerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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---
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hw/usb/bus.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/usb/bus.c b/hw/usb/bus.c
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index fe70429..e48b19f 100644
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--- a/hw/usb/bus.c
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+++ b/hw/usb/bus.c
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@@ -49,7 +49,9 @@ static int usb_device_post_load(void *opaque, int version_id)
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} else {
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dev->attached = 1;
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}
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- if (dev->setup_index >= sizeof(dev->data_buf) ||
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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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return -EINVAL;
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}
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--
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1.9.3
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