Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport

From	Diederik de Haas <didi.debian@cknow.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport
Date	2022-06-21 16:20 +0200
Message-ID	<EAMTv-6huD-1@gated-at.bofh.it> (permalink)
References	<EAFoZ-6cZA-3@gated-at.bofh.it> <EAMqt-6h5x-1@gated-at.bofh.it> <EAFoZ-6cZA-3@gated-at.bofh.it> <EAMqt-6h5x-1@gated-at.bofh.it>
Organization	Connecting Knowledge

Cross-posted to 2 groups.

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On Tuesday, 21 June 2022 15:34:12 CEST Thorsten Glaser wrote:
> >In branch 'linux-4.9.y' there is no qdisc_put function, so the above check
> >seems rightly in qdisc_destroy there.

I'm talking here about 4.9, not 4.19 ...

> Not any more. Since…
> 
> $ git tag --contains 92833e8b5db6
> v4.19.221
> […]

Thanks for that command :-) I usually went through several manual steps to 
figure out in which release(s) a certain commit was. This is much quicker!

> … qdisc_destroy was renamed to qdisc_put in 4.19, breaking modules (grr).

And yes, it is broken in the 4.19 series since 4.19.221
(And not in 5.10 or upstream 'master')

> So yes, this needs to also be fixed upstream (hence me including that tag
> when reporbugging), but perhaps Debian can quickfix.

What I have observed so far is that a commit needs to be accepted upstream 
(but doesn't have to have gone through the whole 'chain of command') before a 
temporary patch is accepted to quickly fix it in Debian.
But as said before, I'm going to leave it up to the maintainers on the best 
way to go about fixing this issue.

Cheers,
  Diederik

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Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport Diederik de Haas <didi.debian@cknow.org> - 2022-06-21 16:20 +0200
  Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport Thorsten Glaser <tg@mirbsd.de> - 2022-06-21 19:30 +0200
  Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport Diederik de Haas <didi.debian@cknow.org> - 2022-06-22 12:00 +0200
    Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport Diederik de Haas <didi.debian@cknow.org> - 2022-06-29 17:00 +0200
      Bug#1013299: linux-image-4.19.0-20-amd64: NULL pointer deref in qdisc_put() due to missing backport Thorsten Glaser <tg@mirbsd.de> - 2022-06-29 18:00 +0200

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