The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
703c13fe3c9a ("efi: fix NULL-deref in init error path") 1fff234de2b6 ("efi: x86: Move EFI runtime map sysfs code to arch/x86") 8dfac4d8ad27 ("efi: runtime-maps: Clarify purpose and enable by default for kexec") 4059ba656ce5 ("efi: memmap: Move EFI fake memmap support into x86 arch tree") d391c5827107 ("drivers/firmware: move x86 Generic System Framebuffers support") 25519d683442 ("ima: generalize x86/EFI arch glue for other EFI architectures") 88e9a5b7965c ("efi/fake_mem: arrange for a resource entry per efi_fake_mem instance") 4d0a4388ccdd ("Merge branch 'efi/urgent' into efi/core, to pick up fixes")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 703c13fe3c9af557d312f5895ed6a5fda2711104 Mon Sep 17 00:00:00 2001 From: Johan Hovold johan+linaro@kernel.org Date: Mon, 19 Dec 2022 10:10:04 +0100 Subject: [PATCH] efi: fix NULL-deref in init error path
In cases where runtime services are not supported or have been disabled, the runtime services workqueue will never have been allocated.
Do not try to destroy the workqueue unconditionally in the unlikely event that EFI initialisation fails to avoid dereferencing a NULL pointer.
Fixes: 98086df8b70c ("efi: add missed destroy_workqueue when efisubsys_init fails") Cc: stable@vger.kernel.org Cc: Li Heng liheng40@huawei.com Signed-off-by: Johan Hovold johan+linaro@kernel.org Signed-off-by: Ard Biesheuvel ardb@kernel.org
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 09716eebe8ac..a2b0cbc8741c 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -394,8 +394,8 @@ static int __init efisubsys_init(void) efi_kobj = kobject_create_and_add("efi", firmware_kobj); if (!efi_kobj) { pr_err("efi: Firmware registration failed.\n"); - destroy_workqueue(efi_rts_wq); - return -ENOMEM; + error = -ENOMEM; + goto err_destroy_wq; }
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE | @@ -443,7 +443,10 @@ static int __init efisubsys_init(void) err_put: kobject_put(efi_kobj); efi_kobj = NULL; - destroy_workqueue(efi_rts_wq); +err_destroy_wq: + if (efi_rts_wq) + destroy_workqueue(efi_rts_wq); + return error; }