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Re: [Qemu-devel] usb-ohci: td.cbp incorrectly updated near page end
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] usb-ohci: td.cbp incorrectly updated near page end |
Date: |
Fri, 06 Jan 2012 10:47:06 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111104 Red Hat/3.1.16-2.el6_1 Thunderbird/3.1.16 |
On 12/22/11 10:34, Andriy Gapon wrote:
> The current code that updates the cbp value after a transfer looks like this:
> td.cbp += ret;
> if ((td.cbp & 0xfff) + ret > 0xfff) {
> <handle page overflow>
> because the 'ret' value is effectively added twice the check may fire too
> early
> when the overflow hasn't happened yet.
Patch added to usb patch queue.
thanks,
Gerd
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