linux-kernel - Re: [PATCH] net: 80003es2lan: fix a missing check of read failure

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Date:   Fri, 21 Dec 2018 11:18:58 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: 80003es2lan: fix a missing check of read failure

On Thu, 2018-12-20 at 15:23 -0600, Kangjie Lu wrote:
> When e1000_read_kmrn_reg_80003es2lan() fails, "kum_reg_data" is
> uninitialized and may contain random value. However, it is further
> used in the following execution, which will lead to undefined
> behaviors.
> The fix checks the failure of e1000_read_kmrn_reg_80003es2lan() and
> returns with its error code if it fails.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/net/ethernet/intel/e1000e/80003es2lan.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

This is a good catch, although we do not want to exit out on failure.  I
have an alternative patch to resolve both issues, which I will submit later
today.  Just need to finish holiday shopping for my wife... :-)

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