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StandaloneMmPkg: Fix section data length returned larger than actual data

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This change fixes an issue where the returned section data length
is always 4 bytes larger than the actual section length. This could
cause an issue where the caller accesses the final 4 bytes which
would be invalid.

Co-authored-by: Kun Qin <kuqin@microsoft.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
This commit is contained in:
Michael Kubacki 2024-07-02 11:43:24 -04:00 committed by mergify[bot]
parent bef0d333dc
commit 051c7bb434
2 changed files with 8 additions and 8 deletions
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2
StandaloneMmPkg/Include/Library/FvLib.h
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@ -87,7 +87,7 @@ FindFfsSectionInSections (
@param FfsFileHeader Pointer to the current file to search.
@param SectionData Pointer to the Section matching SectionType in FfsFileHeader.
NULL if section not found
@param SectionDataSize The size of SectionData
@param SectionDataSize The size of SectionData, excluding the section header.
@retval EFI_NOT_FOUND No files matching the search criteria were found
@retval EFI_SUCCESS

14
StandaloneMmPkg/Library/FvLib/FvLib.c
View File

@ -338,11 +338,11 @@ FfsFindSection (
Given the input file pointer, search for the next matching section in the
FFS volume.
@param SearchType Filter to find only sections of this type.
@param FfsFileHeader Pointer to the current file to search.
@param SectionData Pointer to the Section matching SectionType in FfsFileHeader.
NULL if section not found
@param SectionDataSize The size of SectionData
@param[in] SectionType Filter to find only sections of this type.
@param[in] FfsFileHeader Pointer to the current file to search.
@param[in,out] SectionData Pointer to the Section matching SectionType in FfsFileHeader.
NULL if section not found
@param[in,out] SectionDataSize The size of SectionData, excluding the section header.
@retval EFI_NOT_FOUND No files matching the search criteria were found
@retval EFI_SUCCESS
@ -380,10 +380,10 @@ FfsFindSectionData (
if (Section->Type == SectionType) {
if (IS_SECTION2 (Section)) {
*SectionData = (VOID *)((EFI_COMMON_SECTION_HEADER2 *)Section + 1);
*SectionDataSize = SECTION2_SIZE (Section);
*SectionDataSize = SECTION2_SIZE (Section) - sizeof (EFI_COMMON_SECTION_HEADER2);
} else {
*SectionData = (VOID *)(Section + 1);
*SectionDataSize = SECTION_SIZE (Section);
*SectionDataSize = SECTION_SIZE (Section) - sizeof (EFI_COMMON_SECTION_HEADER);
}
return EFI_SUCCESS;