netdev - Re: [PATCH v2 net-next 0/3] liquidio: avoid vm low memory crashes

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Message-ID: <20170718062317.GJ3259@mtr-leonro.local>
Date:   Tue, 18 Jul 2017 09:23:17 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Felix Manlunas <felix.manlunas@...ium.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        raghu.vatsavayi@...ium.com, derek.chickles@...ium.com,
        satananda.burla@...ium.com, ricardo.farrington@...ium.com
Subject: Re: [PATCH v2 net-next 0/3] liquidio: avoid vm low memory crashes

On Mon, Jul 17, 2017 at 05:49:20PM -0700, Felix Manlunas wrote:
> From: Rick Farrington <ricardo.farrington@...ium.com>
>
> This patchset addresses issues brought about by low memory conditions
> in a VM.  These conditions were not seen when the driver was exercised
> normally.  Rather, they were brought about through manual fault injection.
> They are being included in the interest of hardening the driver against
> unforeseen circumstances.
>
> 1. Fix GPF in octeon_init_droq(); zero the allocated block 'recv_buf_list'.
>    This prevents a GPF trying to access an invalid 'recv_buf_list[i]' entry
>    in octeon_droq_destroy_ring_buffers() if init didn't alloc all entries.
> 2. Don't dereference a NULL ptr in octeon_droq_destroy_ring_buffers().
> 3. For defensive programming, zero the allocated block 'oct->droq[0]' in
>    octeon_setup_output_queues() and 'oct->instr_queue[0]' in
>    octeon_setup_instr_queues().
>
> change log:
> V1 -> V2:
> 1. Corrected syntax in 'Subject' lines; no functional or code changes.
>
> Rick Farrington (3):
>   liquidio: lowmem: init allocated memory to 0
>   liquidio: lowmem: do not dereference null ptr
>   liquidio: lowmem: init allocated memory to 0

I'm feeling déjà vu here. We already discussed that zero allocated arrays
have nothing to do with low memory conditions. Why are you continuing to use
this misleading term here?

>
>  drivers/net/ethernet/cavium/liquidio/octeon_device.c | 8 ++++----
>  drivers/net/ethernet/cavium/liquidio/octeon_droq.c   | 6 ++++--
>  2 files changed, 8 insertions(+), 6 deletions(-)
>
> --
> 2.9.0
>

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