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8d74a37944
In current implementation of MmCommunication, caller (StandaloneMmIplPei or MmCommunicationDxe) sets the IsCommBufferValid to TRUE and triggers synchronous MMI, then caller resets IsCommBufferValid to FLASE after MMI exits. If asynchronous MMI happens before caller resets the IsCommBufferValid to FALSE, StandaloneMmCore will mistakenly thought there is still a synchronous MMI and then update incorrect values into ReturnStatus and ReturnBufferSize. To fix the above issue, StandaloneMmCore should reset IsCommBufferValid to FALSE before MMI exits. Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Sami Mujawar <sami.mujawar@arm.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Jiaxin Wu <jiaxin.wu@intel.com> Signed-off-by: Wei6 Xu <wei6.xu@intel.com>