Files
android_kernel_xiaomi_sm8450/drivers/firmware/efi/efi.c
Anton Gusev 87d4ff1873 efi: fix potential NULL deref in efi_mem_reserve_persistent
[ Upstream commit 966d47e1f27c45507c5df82b2a2157e5a4fd3909 ]

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.

Fixes: 18df7577ad ("efi/memreserve: deal with memreserve entries in unmapped memory")
Signed-off-by: Anton Gusev <aagusev@ispras.ru>
[ardb: return -ENOMEM instead of breaking out of the loop]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-15 17:22:14 +01:00

26 KiB