AccessViolation at ole.c:450

[yangzao]

A null-ptr access bug when testing xls2csv 0.95 on x86-64 Ubuntu 22.04.

Files:

1.zip

Commandline:

./xls2csv ./1

Crash line:

    "    446    \t\tlong int sbdSecNum=e->blocks[blk]/sbdPerSector;",
    "    447    \t\tlong int sbdSecMod=e->blocks[blk]%sbdPerSector;",
    "    448    /* \t\tfprintf(stderr, \"calcoffset: e->name=%s e->numOfBlocks=%ld length=%ld sbdSecNum=%ld rootEntry->blocks=%p\\n\",",
    "    449     \t\t\t\t\t\te->name, e->numOfBlocks, e->length, sbdSecNum, rootEntry->blocks);*/",
    "--->450    \t\tres=512 + rootEntry->blocks[sbdSecNum]*sectorSize + sbdSecMod*shortSectorSize;",
    "    451    \t}",
    "    452    \treturn res;",
    "    453    }",
    "    454    ",
    "    455    "

Stacktrace:

    "    #0 0x55555564f3df in calcFileBlockOffset catdoc/src/ole.c:450:13",
    "    #1 0x55555564faf7 in ole_read catdoc/src/ole.c:493:14",
    "    #2 0x555555640d2f in do_table catdoc/src/xlsparse.c:43:3",
    "    #3 0x55555563e8ba in main catdoc/src/xls2csv.c:167:7",