FAILED: patch "[PATCH] efi: fix NULL-deref in init error path" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

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;
 }