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fix potential invalid mmap call and uninitialized file size #4559

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fix potential invalid mmap call and uninitialized file size #4559

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5f24f87
fix potential invalid mmap call and uninitialized file size
richardsonnick Dec 23, 2025
7114309
Merge branch 'facebook:dev' into fix-zero-filesize-mmap
richardsonnick Mar 12, 2026
01c8f60
Relocate unitialized file size check and use UTIL_FILESIZE_UNKNOWN
richardsonnick Mar 12, 2026
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6 changes: 6 additions & 0 deletions programs/fileio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1041,6 +1041,11 @@ static size_t FIO_setDictBufferMMap(FIO_Dict_t* dict, const char* fileName, FIO_
}

fileSize = UTIL_getFileSizeStat(dictFileStat);
if (fileSize == UTIL_FILESIZE_UNKNOWN) {
EXM_THROW(35, "Could not determine size of dictionary %s", fileName);
}
if (fileSize == 0) return 0;

{
size_t const dictSizeMax = prefs->patchFromMode ? prefs->memLimit : DICTSIZE_MAX;
if (fileSize > dictSizeMax) {
Expand All @@ -1049,6 +1054,7 @@ static size_t FIO_setDictBufferMMap(FIO_Dict_t* dict, const char* fileName, FIO_
}
}


*bufferPtr = mmap(NULL, (size_t)fileSize, PROT_READ, MAP_PRIVATE, fileHandle, 0);
if (*bufferPtr == MAP_FAILED) {
EXM_THROW(34, "%s", strerror(errno))
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