tree 9605b22063128f38d25d5cc587b5c65eee5a3ec4
parent 8106368cb0a70f327cb2cb411a46eb33cb4bded7
author Pierre-Clément Tosi <ptosi@google.com> 1696930045 +0100
committer Pierre-Clément Tosi <ptosi@google.com> 1697045743 +0100

FROMGIT: libfdt: fdt_get_alias_namelen: Validate aliases

Ensure that the alias found matches the device tree specification v0.4:

    Each property of the /aliases node defines an alias. The property
    name specifies the alias name. The property value specifies the full
    path to a node in the devicetree.

This protects against a stack overflow caused by

    fdt_path_offset_namelen(fdt, path, namelen)

calling

    fdt_path_offset(fdt, fdt_get_alias_namelen(fdt, path, namelen))

leading to infinite recursion on DTs with "circular" aliases.

This fix was originally written by Mike McTernan for Android in [1].

[1]: https://android.googlesource.com/platform/external/dtc/+/9308e7f9772bd226fea9925b1fc4d53c127ed4d5

Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
Acked-by: Mike McTernan <mikemcternan@google.com>
Message-ID: <20231010092725.63h7c45p2fnmj577@google.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

(cherry-picked from commit 79b9e326a162b15ca5758ee214e350f4f7c038fe git://git.kernel.org/pub/scm/utils/dtc/dtc.git main)

Test: N/A
Change-Id: I1e5a89039f6b70c82e17739379d97dbf130036e8