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Re: [PATCH v1 3/3] xen/libfdt: fix UBSAN null pointer in fdt_property()
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Wed, 20 May 2026 09:56:10 +0200
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- Cc: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Delivery-date: Wed, 20 May 2026 07:56:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20-May-26 09:51, Oleksii Kurochko wrote:
> Hello Michal,
>
> On 5/19/26 11:37 AM, Orzel, Michal wrote:
>>>> We treat libfdt as external library and we don't accept any edits here
>>>> prior to
>>>> first sending a fix to libfdt and then cherry-picking a patch (in fact,
>>>> afacit
>>>> we then do the libfdt version update).
>>>
>>> Thanks for clarifying that.
>>>
>>> Just to be sure I don't confuse something.
>>> According to the commit ...:
>>>
>>> commit ad9cf6bde5b90d4c1e5a79a2803e98d6344c27d7
>>> Author: Vikram Garhwal <fnu.vikram@xxxxxxxxxx>
>>> Date: Thu Nov 11 23:27:20 2021 -0800
>>>
>>> Update libfdt to v1.6.1
>>>
>>> Update libfdt to v1.6.1 of libfdt taken from
>>> git://github.com/dgibson/dtc.
>>> This update is done to support device tree overlays.
>>>
>>> ... I have to send this patch to git://github.com/dgibson/dtc, right?
>> Yes, that's the main DTC/libfdt repository.
>
> The patch to dtc repo was accepted and merged:
> https://github.com/dgibson/dtc/commit/f57e7df35df4a301961cbbf9433ba4e85c2ee5ed
>
> But current version of dtc is:
> $ cat https://github.com/dgibson/dtc/blob/main/VERSION.txt
> 1.7.2
>
> Does it make sense to backport just one patch to Xen instead of updating
We can backport this patch only the same way as for example here:
d434dc4ac182 ("libfdt: overlay: change overlay_get_target()")
~Michal
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