[MdeModulePkg/Library v1 1/1] MdeModulePkg/UefiBootManangerLib: Fix exception issue

[Ming Huang <ming.huang@linaro.org>]

The system environment: virtual-CDROM(USB interface) via BMC, insert a
iso file to CDROM, like ubuntu-18.04.1-server-arm64.iso, change CDROM
to first boot option.
With release version bios, disconnecting CDROM when boot to
"1 seconds left, Press Esc or F2 to enter Setup"
then system will get a exception.

The root cause is the EFI_BLOCK_IO_PROTOCOL for UsbMass will be uninstalled
in this situation after print some transfer error. The status will be
invalid parameter. This line will get a exception for BlockIo not point
to right address:
AllocatePool (BlockIo->Media->BlockSize)
So, here need to judge the status not using ASSERT_EFI_ERROR.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ming Huang <ming.huang@linaro.org>
---
 MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
index d5957db610d9..c2f1c651b02f 100644
--- a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
+++ b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
@@ -1068,7 +1068,9 @@ BmExpandMediaDevicePath (
   // Block IO read/write will success.
   //
   Status = gBS->HandleProtocol (Handle, &gEfiBlockIoProtocolGuid, (VOID **) &BlockIo);
-  ASSERT_EFI_ERROR (Status);
+  if (EFI_ERROR (Status)) {
+    return NULL;
+  }
   Buffer = AllocatePool (BlockIo->Media->BlockSize);
   if (Buffer != NULL) {
     BlockIo->ReadBlocks (
-- 
2.9.5