linux-kernel - Re: [PATCH] can: Fix kernel panic at security_sock_rcv

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Date:   Thu, 12 Jan 2017 15:10:18 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     william.c.roberts@...el.com
Cc:     selinux@...ho.nsa.gov, socketcan@...tkopp.net, mkl@...gutronix.de,
        davem@...emloft.net, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        sds@...ho.nsa.gov, paul@...l-moore.com,
        Zhang Yanmin <yanmin.zhang@...el.com>, He@...r.kernel.org,
        Bo <bo.he@...el.com>, Liu Shuo A <shuo.a.liu@...el.com>
Subject: Re: [PATCH] can: Fix kernel panic at security_sock_rcv_skb

On Thu, 2017-01-12 at 14:40 -0800, william.c.roberts@...el.com wrote:
> From: Zhang Yanmin <yanmin.zhang@...el.com>
> 
> The patch is for fix the below kernel panic:
> BUG: unable to handle kernel NULL pointer dereference at (null)
> IP: [<ffffffff81495e25>] selinux_socket_sock_rcv_skb+0x65/0x2a0

Same patch was sent earlier, and we gave a feedback on it.

Adding synchronize_rcu() calls is a step backward.

https://patchwork.ozlabs.org/patch/714446/