[PATCH v3 2/5] OvmfPkg/X86QemuLoadImageLib: plug cmdline blob leak on success

["Dov Murik" <dovmurik@linux.ibm.com>]

When QemuLoadKernelImage() ends successfully, the command-line blob is
not freed, even though it is not used elsewhere (its content is already
copied to KernelLoadedImage->LoadOptions).  The memory leak bug was
introduced in commit 7c47d89003a6 ("OvmfPkg: implement QEMU loader
library for X86 with legacy fallback", 2020-03-05).

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Tobin Feldman-Fitzthum <tobin@linux.ibm.com>
Reported-by: Laszlo Ersek <lersek@redhat.com>
Fixes: 7c47d89003a6f8f7f6f0ce8ca7d3e87c630d14cc
Signed-off-by: Dov Murik <dovmurik@linux.ibm.com>
---
 OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
index 1177582ab051..6b1e7e649014 100644
--- a/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
+++ b/OvmfPkg/Library/X86QemuLoadImageLib/X86QemuLoadImageLib.c
@@ -446,14 +446,16 @@ QemuLoadKernelImage (
   }
 
   *ImageHandle = KernelImageHandle;
-  return EFI_SUCCESS;
+  Status = EFI_SUCCESS;
 
 FreeCommandLine:
   if (CommandLineSize > 0) {
     FreePool (CommandLine);
   }
 UnloadImage:
-  gBS->UnloadImage (KernelImageHandle);
+  if (EFI_ERROR (Status)) {
+    gBS->UnloadImage (KernelImageHandle);
+  }
 
   return Status;
 }
-- 
2.25.1