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usb: fix up post load checks 

Correct post load checks:
1. dev->setup_len == sizeof(dev->data_buf)
    seems fine, no need to fail migration
2. When state is DATA, passing index > len
   will cause memcpy with negative length,
   resulting in heap overflow

First of the issues was reported by dgilbert.

Reported-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-05-13 12:33:16 +03:00 committed by Juan Quintela
parent d6ed7312d1
commit 719ffe1f5f
1 changed files with 2 additions and 2 deletions
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4
hw/usb/bus.c
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@ -51,8 +51,8 @@ static int usb_device_post_load(void *opaque, int version_id)
}
if (dev->setup_index < 0 ||
dev->setup_len < 0 ||
dev->setup_index >= sizeof(dev->data_buf) ||
dev->setup_len >= sizeof(dev->data_buf)) {
dev->setup_index > dev->setup_len ||
dev->setup_len > sizeof(dev->data_buf)) {
return -EINVAL;
}
return 0;