Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: cee9d1b16bdcd7fe8bad6b39fe18af0a15941ca4
https://github.com/tianocore/edk2/commit/cee9d1b16bdcd7fe8bad6b39fe18af0a15941ca4
Author: Kun Qin <[email protected]>
Date: 2024-07-17 (Wed, 17 Jul 2024)
Changed paths:
M MdeModulePkg/Core/Dxe/Mem/HeapGuard.c
Log Message:
-----------
MdeModulePkg: DxeCore: Fix Use-After-Free guard causing page fault
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 <[email protected]>
Signed-off-by: Kun Qin <[email protected]>
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