[edk2-devel] [edk2-platforms][PATCH V3 11/17] Platform/ARM/NorFlashDxe: Fix memory leak in NorFlashCreateInstance()

["Sahil Kaushal" <sahil.kaushal@arm.com>]

From: sahil <sahil@arm.com>

This patch adds error_handler1 and error_handler2 labels in
NorFlashCreateInstance() function to handle the cleanup.

error_handler1: Frees just the Instance structure as the
ShadowBuffer is not allocated yet.

error_handler2: Frees both Instance and Instance->ShadowBuffer.

Signed-off-by: sahil <sahil@arm.com>
---
 Platform/ARM/Drivers/NorFlashDxe/NorFlashDxe.c          | 18 +++++++++++++-----
 Platform/ARM/Drivers/NorFlashDxe/NorFlashStandaloneMm.c | 19 ++++++++++++++-----
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/Platform/ARM/Drivers/NorFlashDxe/NorFlashDxe.c b/Platform/ARM/Drivers/NorFlashDxe/NorFlashDxe.c
index e01b05d91978..fd47bd9e4c63 100644
--- a/Platform/ARM/Drivers/NorFlashDxe/NorFlashDxe.c
+++ b/Platform/ARM/Drivers/NorFlashDxe/NorFlashDxe.c
@@ -135,7 +135,8 @@ NorFlashCreateInstance (
 
   Instance->ShadowBuffer = AllocateRuntimePool (BlockSize);
   if (Instance->ShadowBuffer == NULL) {
-    return EFI_OUT_OF_RESOURCES;
+    Status = EFI_OUT_OF_RESOURCES;
+    goto error_handler1;
   }
 
   if (SupportFvb) {
@@ -152,8 +153,7 @@ NorFlashCreateInstance (
                     NULL
                     );
     if (EFI_ERROR (Status)) {
-      FreePool (Instance);
-      return Status;
+      goto error_handler2;
     }
   } else {
     Status = gBS->InstallMultipleProtocolInterfaces (
@@ -167,12 +167,20 @@ NorFlashCreateInstance (
                     NULL
                     );
     if (EFI_ERROR (Status)) {
-      FreePool (Instance);
-      return Status;
+      goto error_handler2;
     }
   }
 
   *NorFlashInstance = Instance;
+  return EFI_SUCCESS;
+
+error_handler1:
+  FreePool (Instance);
+  return Status;
+
+error_handler2:
+  FreePool (Instance->ShadowBuffer);
+  FreePool (Instance);
   return Status;
 }
 
diff --git a/Platform/ARM/Drivers/NorFlashDxe/NorFlashStandaloneMm.c b/Platform/ARM/Drivers/NorFlashDxe/NorFlashStandaloneMm.c
index 16fe3762e125..17dfe26627dd 100644
--- a/Platform/ARM/Drivers/NorFlashDxe/NorFlashStandaloneMm.c
+++ b/Platform/ARM/Drivers/NorFlashDxe/NorFlashStandaloneMm.c
@@ -129,7 +129,8 @@ NorFlashCreateInstance (
 
   Instance->ShadowBuffer = AllocateRuntimePool (BlockSize);
   if (Instance->ShadowBuffer == NULL) {
-    return EFI_OUT_OF_RESOURCES;
+    Status = EFI_OUT_OF_RESOURCES;
+    goto error_handler1;
   }
 
   if (SupportFvb) {
@@ -142,16 +143,24 @@ NorFlashCreateInstance (
                       &Instance->FvbProtocol
                       );
     if (EFI_ERROR (Status)) {
-      FreePool (Instance);
-      return Status;
+      goto error_handler2;
     }
   } else {
     DEBUG ((DEBUG_ERROR, "standalone MM NOR Flash driver only support FVB.\n"));
-    FreePool (Instance);
-    return EFI_UNSUPPORTED;
+    Status = EFI_UNSUPPORTED;
+    goto error_handler2;
   }
 
   *NorFlashInstance = Instance;
+  return EFI_SUCCESS;
+
+error_handler1:
+  FreePool (Instance);
+  return Status;
+
+error_handler2:
+  FreePool (Instance->ShadowBuffer);
+  FreePool (Instance);
   return Status;
 }
 
-- 
2.25.1



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