[dpdk-dev] [PATCH v2] kni: fix possible kernel crash with va2pa

Ferruh Yigit ferruh.yigit at intel.com
Tue Mar 19 19:35:19 CET 2019

On 3/12/2019 9:22 AM, Yangchao Zhou wrote:
> va2pa depends on the physical address and virtual address offset of
> current mbuf. It may get the wrong physical address of next mbuf which
> allocated in another hugepage segment.
> In rte_mempool_populate_default(), trying to allocate whole block of
> contiguous memory could be failed. Then, it would reserve memory in
> several memzones that have different physical address and virtual address
> offsets. The rte_mempool_populate_default() is used by
> rte_pktmbuf_pool_create().
> Signed-off-by: Yangchao Zhou <zhouyates at gmail.com>
> ---
> v2: Add an explanation that causes this problem.
>     Use m->next to store physical address.

Overall code looks good to me, thanks for the work, it looks pretty clean.
I would like to do some test before giving an ack.

Meanwhile, can you please update kni documentation, to document for the mbufs
sent to kernel has mbuf->next fields as physical address. It is OK to send as a
new version of the patch with documentation.


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