netdev - Re: [PATCH net-next] rtnetlink: Fix null-ptr-deref in rtnl

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Date:   Fri, 01 Jun 2018 10:39:55 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     bhole_prashant_q7@....ntt.co.jp
Cc:     edumazet@...gle.com, daniel@...earbox.net, ast@...nel.org,
        ktkhai@...tuozzo.com, fw@...len.de, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] rtnetlink: Fix null-ptr-deref in rtnl_newlink

From: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
Date: Fri,  1 Jun 2018 17:16:58 +0900

> In rtnl_newlink(), NULL check is performed on m_ops however member of
> ops is accessed. Fixed by accessing member of m_ops instead of ops.
> 
> [  345.432629] BUG: KASAN: null-ptr-deref in rtnl_newlink+0x400/0x1110
> [  345.432629] Read of size 4 at addr 0000000000000088 by task ip/986
> [  345.432629]
> [  345.432629] CPU: 1 PID: 986 Comm: ip Not tainted 4.17.0-rc6+ #9
> [  345.432629] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
> [  345.432629] Call Trace:
> [  345.432629]  dump_stack+0xc6/0x150
> [  345.432629]  ? dump_stack_print_info.cold.0+0x1b/0x1b
> [  345.432629]  ? kasan_report+0xb4/0x410
> [  345.432629]  kasan_report.cold.4+0x8f/0x91
> [  345.432629]  ? rtnl_newlink+0x400/0x1110
> [  345.432629]  rtnl_newlink+0x400/0x1110
> [...]
> 
> Fixes: ccf8dbcd062a ("rtnetlink: Remove VLA usage")
> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>

Applied, thanks.