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From: Avi Kivity on 12 Apr 2010 06:30
On 04/12/2010 04:57 AM, wzt.wzt(a)gmail.com wrote:
> coalesced_mmio_write() is not check the len value, if len is negative,
> memcpy(ring->coalesced_mmio[ring->last].data, val, len); will cause
> stack buffer overflow.
>
>

How can len be negative? It can only be between 1 and 8.

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I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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