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cee9d1b16b
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2411 With Use-After-Free heap guard feature enabled, the DxeCore would blindly attempt to "level-up" when the `GuardAllFreedPages` inspect a non-max level table entry from the last loop. This could cause the next round of inspection to dereference a potentially null pointer and as such causing a page fault. This change adds a null pointer check to prevent such case from happening. Cc: Liming Gao <gaoliming@byosoft.com.cn> Signed-off-by: Kun Qin <kun.qin@microsoft.com>