mirror of https://github.com/acidanthera/audk.git
beafabdae4
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4543 REF: https://uefi.org/specs/UEFI/2.10/07_Services_Boot_Services.html#efi-boot-services-locatehandlebuffer CoreLocateHandleBuffer() can in certain cases, return an error and not free an allocated buffer. This scenario occurs if the first call to InternalCoreLocateHandle() returns success and the second call returns an error. On a successful return, LocateHandleBuffer() passes ownership of the buffer to the caller. However, the UEFI specification is not explicit about what the expected ownership of this buffer is in the case of an error. However, it is heavily implied by the code example given in section 7.3.15 of v2.10 of the UEFI specificaton that if LocateHandleBuffer() returns a non-successful status code then the ownership of the buffer does NOT transfer to the caller. This code example explicitly refrains from calling FreePool() if LocateHandleBuffer() returns an error. From a practical standpoint, it is logical to assume that a non-successful status code indicates that no buffer of handles was ever allocated. Indeed, in most error cases, LocateHandleBuffer() does not go far enough to get to the point where a buffer is allocated. Therefore, all existing users of this API must already be coded to support the case of a non-successful status code resulting in an invalid handle buffer being returned. Therefore, this change will not cause any backwards compatibility issues with existing code. In conclusion, this boils down to a fix for a memory leak that also brings the behavior of our LocateHandleBuffer() implementation into alignment with the original intentions of the UEFI specification authors. Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Dandan Bi <dandan.bi@intel.com> Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com> |
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