netdev - Re: [PATCH v2 net] hsr: fix a NULL pointer dereference in hsr_dev

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Date:   Thu, 05 Dec 2019 12:10:06 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     ap420073@...il.com
Cc:     xiyou.wangcong@...il.com, netdev@...r.kernel.org,
        treeze.taeung@...il.com
Subject: Re: [PATCH v2 net] hsr: fix a NULL pointer dereference in
 hsr_dev_xmit()

From: Taehee Yoo <ap420073@...il.com>
Date: Thu,  5 Dec 2019 07:23:39 +0000

> hsr_dev_xmit() calls hsr_port_get_hsr() to find master node and that would
> return NULL if master node is not existing in the list.
> But hsr_dev_xmit() doesn't check return pointer so a NULL dereference
> could occur.
> 
> Test commands:
 ...
> Splat looks like:
 ...
> Fixes: 311633b60406 ("hsr: switch ->dellink() to ->ndo_uninit()")
> Acked-by: Cong Wang <xiyou.wangcong@...il.com>
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Applied and queued up for v5.3 -stable, thanks.