netdev - Re: [PATCH net] macvlan: fix null dereference in macvlan_device

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Date:   Tue, 21 Apr 2020 15:52:53 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     ap420073@...il.com
Cc:     kuba@...nel.org, dingtianhong@...wei.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] macvlan: fix null dereference in
 macvlan_device_event()

From: Taehee Yoo <ap420073@...il.com>
Date: Mon, 20 Apr 2020 13:29:40 +0000

> In the macvlan_device_event(), the list_first_entry_or_null() is used.
> This function could return null pointer if there is no node.
> But, the macvlan module doesn't check the null pointer.
> So, null-ptr-deref would occur.
> 
>       bond0
>         |
>    +----+-----+
>    |          |
> macvlan0   macvlan1
>    |          |
>  dummy0     dummy1
> 
> The problem scenario.
 ...
> Test commands:
 ...
> Splat looks like:
 ...
> Fixes: e289fd28176b ("macvlan: fix the problem when mac address changes for passthru mode")
> Reported-by: syzbot+5035b1f9dc7ea4558d5a@...kaller.appspotmail.com
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Applied and queued up for -stable, thank you.