Bug#850064: /boot/vmlinuz-4.8.0-2-amd64: kernel NULL pointer dereference in icmp6_send related to bridge port link changes

To: 850064@bugs.debian.org
Subject: Bug#850064: /boot/vmlinuz-4.8.0-2-amd64: kernel NULL pointer dereference in icmp6_send related to bridge port link changes
From: Bjørn Mork <bjorn@mork.no>
Date: Tue, 03 Jan 2017 22:36:31 +0100
Message-id: <[🔎] 87bmvng71c.fsf@miraculix.mork.no>
Reply-to: Bjørn Mork <bjorn@mork.no>, 850064@bugs.debian.org
In-reply-to: <87tw9gf2h9.fsf_-___26979.0136990652$1483467156$gmane$org@miraculix.mork.no> ("Bjørn Mork"'s message of "Tue, 03 Jan 2017 19:00:18 +0100")
References: <[🔎] 20170103173829.7050.45913.reportbug@canardo.mork.no> <handler.850064.B.148346587515125.ack@bugs.debian.org> <87tw9gf2h9.fsf_-___26979.0136990652$1483467156$gmane$org@miraculix.mork.no>

OK, this looks like a known v4.8 stable regression, caused by the
backport of commit 5d41ce29e3b9 ("net: icmp6_send should use dst dev to
determine L3 domain") introduced in v4.8.10.

Should be fixed by commit 79dc7e3f1cd3 ("net: handle no dst on skb in
icmp6_send") as soon as Debian moves to v4.9

Ref https://bugzilla.kernel.org/show_bug.cgi?id=189851



Bjørn

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References:
- Bug#850064: /boot/vmlinuz-4.8.0-2-amd64: kernel NULL pointer dereference in icmp6_send related to bridge port link changes
  - From: Bjørn Mork <bjorn@mork.no>

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