In the Linux kernel, the following vulnerability has been resolved:

ARM: integrator: Fix early initialization

Starting with commit bdb249fce9ad4 ("ARM: integrator: read counter using
syscon/regmap"), intcp_init_early calls syscon_regmap_lookup_by_compatible
which in turn calls of_syscon_register. This function allocates memory.
Since the memory management code has not been initialized at that time,
the call always fails. It either returns -ENOMEM or crashes as follows.

Unable to handle kernel NULL pointer dereference at virtual address 0000000c when read
[0000000c] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.15.0-rc5-00026-g5fcc9bf84ee5 #1 PREEMPT
Hardware name: ARM Integrator/CP (Device Tree)
PC is at __kmalloc_cache_noprof+0xec/0x39c
LR is at __kmalloc_cache_noprof+0x34/0x39c
...
Call trace:
 __kmalloc_cache_noprof from of_syscon_register+0x7c/0x310
 of_syscon_register from device_node_get_regmap+0xa4/0xb0
 device_node_get_regmap from intcp_init_early+0xc/0x40
 intcp_init_early from start_kernel+0x60/0x688
 start_kernel from 0x0

The crash is seen due to a dereferenced pointer which is not supposed to be
NULL but is NULL if the memory management subsystem has not been
initialized. The crash is not seen with all versions of gcc. Some versions
such as gcc 9.x apparently do not dereference the pointer, presumably if
tracing is disabled. The problem has been reproduced with gcc 10.x, 11.x,
and 13.x. Either case, if the crash is not seen, the call to
syscon_regmap_lookup_by_compatible returns -ENOMEM, and
sched_clock_register is never called.

Fix the problem by moving the early initialization code into the standard
machine initialization code.

https://git.kernel.org/stable/c/22c738fb51f2d8b23ddff5cc0ccb2dd685bb39d3

https://git.kernel.org/stable/c/33ad014abec90f37dade0e00560f28864187e21a

https://git.kernel.org/stable/c/508b1193d63b5e073a3fe103eeb785fcba2d368c

https://git.kernel.org/stable/c/58a112b0973f6cd6bcb8c503d1ff88be411ed0f0

https://git.kernel.org/stable/c/6624854554c4c2bdfed3559e5c11bb03b16e7bd1

https://git.kernel.org/stable/c/812103fb6da904bd03d62cf6a9826e537318ceed

https://git.kernel.org/stable/c/90d77b30a666049ad24df463f52e5d529c44e8cd

https://git.kernel.org/stable/c/e984dc22e2c24dc34d6728e338c82b1ce7862753

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