Re: e100 REGRESSION in 2.6.32 (PATCH v2)

From: Brandeburg, Jesse
Date: Thu Dec 17 2009 - 12:22:19 EST



On Thu, 17 Dec 2009, Roger Oksanen wrote:
> e100: Fix broken cbs accounting due to missing memset.
>
> Alan Stern noticed that e100 caused slab corruption.
> commit 98468efddb101f8a29af974101c17ba513b07be1 changed
> the allocation of cbs to use dma pools that don't return zeroed memory,
> especially the cb->status field used to track which cb to clean, causing
> (the visible) double freeing of skbs and a wrong free cbs count.
>
> Now the cbs are explicitly zeroed at allocation time.
>
> Reported-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> Tested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Roger Oksanen <roger.oksanen@xxxxxxxxxxxxxx>

Change looks reasonable, ACK.

should we also consider a followon patch to zero memory allocated with
pci_pools? Seems useful.

Acked-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx>
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