netdev - Re: [PATCH net] llc: better deal with too small mtu

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Message-Id: <20180508.001215.949760638428127407.davem@davemloft.net>
Date:   Tue, 08 May 2018 00:12:15 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net] llc: better deal with too small mtu

From: Eric Dumazet <edumazet@...gle.com>
Date: Mon,  7 May 2018 09:02:25 -0700

> syzbot loves to set very small mtu on devices, since it brings joy.
> We must make llc_ui_sendmsg() fool proof.

This thing is just too smart for it's own good :)

> usercopy: Kernel memory overwrite attempt detected to wrapped address (offset 0, size 18446612139802320068)!
 ...
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied and queued up for -stable, thanks Eric.