From: Pierre Gondois <pierre.gond...@arm.com>
On Arm platforms, the number of available RNG algorithms is
dynamically detected and can be 0 in the absence of FEAT_RNG
and firmware TRNG.
In this case, the EFI_RNG_PROTOCOL should not be installed to
prevent from installing an empty protocol.
Signed-off-by: Pierre Gondois <pierre.gond...@arm.com>
---
.../RandomNumberGenerator/RngDxe/RngDxe.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.c
b/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.c
index 421abb52b8bf..d30cb7f47696 100644
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.c
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.c
@@ -63,6 +63,18 @@ RngDriverEntry (
EFI_STATUS Status;
EFI_HANDLE Handle;
+ //
+ // Get the list of available algorithm.
+ //
+ Status = GetAvailableAlgorithms ();
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ if (mAvailableAlgoArrayCount == 0) {
+ return EFI_UNSUPPORTED;
+ }
+
//
// Install UEFI RNG (Random Number Generator) Protocol
//
@@ -74,13 +86,10 @@ RngDriverEntry (
NULL
);
if (EFI_ERROR (Status)) {
- return Status;
+ FreeAvailableAlgorithms ();
}
- //
- // Get the list of available algorithm.
- //
- return GetAvailableAlgorithms ();
+ return Status;
}
/**
--
2.25.1
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