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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=779 For the API EfiShellOpenRootByHandle(): The return status of the call to SimpleFileSystem->OpenVolume should be checked. It is possible that there is a media change in the device (like CD/DVD ROM). In such case, the volume root opened and/or the device path opened previously (also within EfiShellOpenRootByHandle) may be invalid. This commit adds a check for the result of OpenVolume before subsequently calling functions like EfiShellGetMapFromDevicePath() & ConvertEfiFileProtocolToShellHandle(). Cc: Jaben Carsey <jaben.carsey@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>