linux-kernel - Re: nvme crash - Re: linux-next: Tree for Aug 13

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Date:   Fri, 14 Aug 2020 14:37:52 +0100
From:   John Garry <john.garry@...wei.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     linux-nvme <linux-nvme@...ts.infradead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        <chaitanya.kulkarni@....com>
Subject: Re: nvme crash - Re: linux-next: Tree for Aug 13

On 14/08/2020 14:07, John Garry wrote:
> 
> BTW, as for the DMA/sg scatterlist code, it so happens in this case that 
> we try the dma alloc for size=0 in nvme_alloc_queue() - I know an 
> allocation for size=0 makes no sense, but couldn't we bit a bit more 
> robust?

it's giving ZERO_SIZE_PTR, which we deference, so ignore me...