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



Control: tag -1 help

On Tuesday, 21 June 2022 13:35:09 CEST Thorsten Glaser wrote:
> >So I'm inclined to think that 92833e8b5db6c209e9311ac8c6a44d3bf1856659 is
> >the commit which brought the bug back.
> 
> Yes, definitely. The lines…
> 
>         if (!qdisc)
>                 return;
> 
> … from near the beginning of the now-static qdisc_destroy must
> be moved to the beginning of the new qdisc_put function.

Agreed. That would make it in line with 'master' and 'linux-5.10.y'.
In branch 'linux-4.9.y' there is no qdisc_put function, so the above check 
seems rightly in qdisc_destroy there.

This should be reported upstream, but I don't know what the best cq 
appropriate way to do that, so I'm referring that to the actual Debian  
maintainers, hence the 'help' tag.

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