CVE-2023-52976 Information

Description

In the Linux kernel the following vulnerability has been resolved:

efi: fix potential NULL deref in efi_mem_reserve_persistent

When iterating on a linked list a result of memremap is dereferenced without checking it for NULL.

This patch adds a check that falls back on allocating a new page in case memremap doesn’t succeed.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

[ardb: return -ENOMEM instead of breaking out of the loop]

Reference

https://git.kernel.org/stable/c/87d4ff18738fd71e7e3c10827c80257da6283697 https://git.kernel.org/stable/c/966d47e1f27c45507c5df82b2a2157e5a4fd3909 https://git.kernel.org/stable/c/a2e6a9ff89f13666a1c3ff7195612ab949ea9afc https://git.kernel.org/stable/c/d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c https://git.kernel.org/stable/c/d92a25627bcdf264183670da73c9a60c0bac327e