efi_loader: GetNextMonotonicCount() check parameter
Do not write to address indicated by NULL pointer.
UEFI SCT II 2.6 (2017), 3.6.5 GetNextMonotonicCount(), 5.1.5.5.1
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index ce6ca06..971bd5f 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1916,10 +1916,17 @@
static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
{
static uint64_t mono;
+ efi_status_t ret;
EFI_ENTRY("%p", count);
+ if (!count) {
+ ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
*count = mono++;
- return EFI_EXIT(EFI_SUCCESS);
+ ret = EFI_SUCCESS;
+out:
+ return EFI_EXIT(ret);
}
/**