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In function FindFileEntry(): Instead of using the function parameter 'FileEntry', use a local variable to store the buffer allocated for disk read operation. For the below calling stack: UdfOpenVolume() -> FindRootDirectory() -> FindFileEntry() In FindFileEntry(), the call to 'DiskIo->ReadDisk()' is possible (e.g. media change for a CD/DVD ROM device) to trigger a re-install of the BlockIO(2) protocol which will further lead to a call of the BindingStop() & BingdingStart() of the UdfDxe driver. Meanwhile, for the above listed calling stack, the '**FileEntry' parameter passed into FindFileEntry() is '&PrivFsData->Root'. 'PrivFsData' is a driver-managed private data, it will be freed in BindingStop() and re-allocate in BingdingStart(). In such case, if '*FileEntry' is used to store the allocated buffer, the information will be lost if 'DiskIo->ReadDisk()' triggers a re-install of the BlockIO(2) protocol. The subsequent call of the FreePool API: FreePool (*FileEntry); will cause issues. This commit uses a local variable to store the allocated buffer. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Star Zeng <star.zeng@intel.com> Cc: Eric Dong <eric.dong@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Paulo Alcantara <pcacjr@zytor.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.