netdev - Re: [PATCH net] sfc: don't try and read ef10 data on non-ef10 NIC

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Date:   Tue, 15 Aug 2017 17:19:45 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     bkenward@...arflare.com
Cc:     netdev@...r.kernel.org, linux-net-drivers@...arflare.com,
        sbrivio@...hat.com
Subject: Re: [PATCH net] sfc: don't try and read ef10 data on non-ef10 NIC

From: Bert Kenward <bkenward@...arflare.com>
Date: Tue, 15 Aug 2017 14:55:32 +0100

> The MAC stats command takes a port ID, which doesn't exist on
> pre-ef10 NICs (5000- and 6000- series). This is extracted from the
> NIC specific data; we misinterpret this as the ef10 data structure,
> causing us to read potentially unallocated data. With a KASAN kernel
> this can cause errors with:
>    BUG: KASAN: slab-out-of-bounds in efx_mcdi_mac_stats
> 
> Fixes: 0a2ab4d988d7 ("sfc: set the port-id when calling MC_CMD_MAC_STATS")
> Reported-by: Stefano Brivio <sbrivio@...hat.com>
> Tested-by: Stefano Brivio <sbrivio@...hat.com>
> Signed-off-by: Bert Kenward <bkenward@...arflare.com>

Applied, thanks.