netdev - Re: [PATCH] ipv6: Fix idev->addr

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Date:   Wed, 12 Apr 2017 13:24:12 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     rabin.vincent@...s.com
Cc:     netdev@...r.kernel.org, dsa@...ulusnetworks.com, rabinv@...s.com
Subject: Re: [PATCH] ipv6: Fix idev->addr_list corruption

From: Rabin Vincent <rabin.vincent@...s.com>
Date: Mon, 10 Apr 2017 08:36:39 +0200

> From: Rabin Vincent <rabinv@...s.com>
> 
> addrconf_ifdown() removes elements from the idev->addr_list without
> holding the idev->lock.
> 
> If this happens while the loop in __ipv6_dev_get_saddr() is handling the
> same element, that function ends up in an infinite loop:
> 
>   NMI watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [test:1719]
>   Call Trace:
>    ipv6_get_saddr_eval+0x13c/0x3a0
>    __ipv6_dev_get_saddr+0xe4/0x1f0
>    ipv6_dev_get_saddr+0x1b4/0x204
>    ip6_dst_lookup_tail+0xcc/0x27c
>    ip6_dst_lookup_flow+0x38/0x80
>    udpv6_sendmsg+0x708/0xba8
>    sock_sendmsg+0x18/0x30
>    SyS_sendto+0xb8/0xf8
>    syscall_common+0x34/0x58
> 
> Fixes: 6a923934c33 (Revert "ipv6: Revert optional address flusing on ifdown.")
> Signed-off-by: Rabin Vincent <rabinv@...s.com>

Applied and queued up for -stable, thank you.