From: Johan Hovold johan+linaro@kernel.org
[ Upstream commit 703c13fe3c9af557d312f5895ed6a5fda2711104 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/efi/efi.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index ba03f5a4b30c..a2765d668856 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -385,8 +385,8 @@ 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 | @@ -429,7 +429,10 @@ static int __init efisubsys_init(void) generic_ops_unregister(); err_put: kobject_put(efi_kobj); - destroy_workqueue(efi_rts_wq); +err_destroy_wq: + if (efi_rts_wq) + destroy_workqueue(efi_rts_wq); + return error; }