[PATCH 12/16] efi_loader: optional pointer for ConvertPointer

[Heinrich Schuchardt]

If the EFI_OPTIONAL_PTR is set in DebugDisposition, a NULL pointer does not
constitute an invalid parameter.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 include/efi_api.h            | 2 ++
 lib/efi_loader/efi_runtime.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/efi_api.h b/include/efi_api.h
index 1c40ffc4f5..c56703fc5e 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -250,6 +250,8 @@ struct efi_rt_properties_table {
 	u32 runtime_services_supported;
 };

+#define EFI_OPTIONAL_PTR	0x00000001
+
 struct efi_runtime_services {
 	struct efi_table_hdr hdr;
 	efi_status_t (EFIAPI *get_time)(struct efi_time *time,
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 67fa693e41..664a0422e2 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -511,6 +511,12 @@ efi_convert_pointer(efi_uintn_t debug_disposition, void **address)
 		ret = EFI_INVALID_PARAMETER;
 		goto out;
 	}
+	if (!*address) {
+		if (debug_disposition & EFI_OPTIONAL_PTR)
+			return EFI_SUCCESS;
+		else
+			return EFI_INVALID_PARAMETER;
+	}

 	for (i = 0; i < efi_descriptor_count; i++) {
 		struct efi_mem_desc *map = (void *)efi_virtmap +
--
2.25.1