[Bug 49396] New: winedump crashes parsing the helpstring for sltg tlb file

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49396

Bug ID: 49396
           Summary: winedump crashes parsing the helpstring for sltg tlb
                    file
           Product: Wine
           Version: 5.10
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 67465
  --> https://bugs.winehq.org/attachment.cgi?id=67465
tlb file

winedump crashes parsing the helpstring for example sltg tlb file
winedump: ../../../wine/tools/winedump/tlb.c:1199: decode_string: Assertion
`strlen(buf) + strlen(p) + 1 <= buf_size' failed.

Complete output:

Contents of /home/vijay/dspcalc2.tlb: 3329 bytes

Header {
    magic = 47544c53h
    # file blocks = 6
    pad = 000dh
    size of index = 0035h
    first block = 1
    guid = {000204ff-0000-0000-c000-000000000046}
    res1c = 00000034h
    res20 = ffff0000h
}
Block entry 0 {
    len = 000000cbh
    index string = 2bh "8b09b0558"
    next = 0002h
}
Block entry 1 {
    len = 00000224h
    index string = 21h "9b09b0558"
    next = 0003h
}
Block entry 2 {
    len = 00000104h
    index string = 17h "ab09b0558"
    next = 0004h
}
Block entry 3 {
    len = 00000145h
    index string = dh "bb09b0558"
    next = 0005h
}
Block entry 4 {
    len = 00000707h
    index string = 9h "dir"
    next = 0000h
}
index:
"\1CompObj"
"dir"
"bb09b0558"
"ab09b0558"
"9b09b0558"
"8b09b0558"

pad:
00000081: 00 00 00 00 00 00 00 00-00 00 36 28 50           ..........6(P

Block 0 {
    0000008e: 01 05 ff ff ff ff ff ff-ff ff 1e 00 00 00 ff ff  ..��������....��
    0000009e: ff ff 00 00 00 00 01 00-ff ff 02 00 02 00 01 00  ��......��......
    000000ae: ff ff 01 6e 00 00 00 0a-1a 12 00 64 00 00 00 56  ��.n.......d...V
    000000be: 00 00 00 00 40 fe ff ff-ff 0a 1a 24 00 74 00 01  ....@����..$.t..
    000000ce: 00 56 00 12 00 00 40 fe-ff ff ff 0a 1a 36 00 84  .V....@����..6.�
    000000de: 00 02 00 56 00 24 00 00-40 fe ff ff ff 0a 1a 48  ...V.$..@����..H
    000000ee: 00 96 00 03 00 56 00 36-00 00 40 fe ff ff ff 0a  .�...V.6..@����.
    000000fe: 1a ff ff a6 00 04 00 56-00 48 00 00 40 fe ff ff  .���...V.H..@���
    0000010e: ff ff ff 36 00 ff ff 12-00 ff ff ff ff 24 00 48  ���6.��..����$.H
    0000011e: 00 ff ff 00 00 00 00 05-00 00 00 00 00 ff ff 00  .��..........��.
    0000012e: 00 ff ff ff ff 48 00 ff-ff ff ff ff ff 00 00 00  .����H.������...
    0000013e: 00 00 00 00 00 02 00 01-00 ff ff ff ff 00 00 ff  .........����..�
    0000014e: ff ff ff ff ff ff ff 0a-00 5a 00                 �������..Z.
}
Block 0 {
    magic = 0501h
    href offset = ffffffffh
    res06 = ffffffffh
    member offset = 0x1e (+0x8e=0xac)
    res0e = ffffffffh
    version = 00000000h
    res16 = ffff0001h
    misc = 00020002h
    misc: unknown1 02, flags 0000, unknown2 02, typekind 0 (TKIND_ENUM)
    res1e = ffff0001h
    member_header starts at 0xac, current offset = 0xb0
    res00 = 6e01h
    res02 = 0000h
    res04 = 00h
    extra = 00121a0ah
    variable 0 {
        000000b9: 64 00 00 00 56 00 00 00-00 40 fe ff ff ff 0a 1a 
d...V....@����..
        000000c9: 24 00                                            $.
        magic = 64h
        flags = 00h
        next offset = 0 (+0xb9=0xb9)
        name = 0056h
        oInst = 0000h
        type offset = 0x4000 (+0xb9=0x40b9)
        type:
        type description starts at 0x40b9
        ff80 | (127)
        type description ends at 0x40b9
        memid = fffffffeh
        helpcontext = 1a0ah
        helpstring offset = 0x24 (+0xb9=0xdd)
winedump: ../../../wine/tools/winedump/tlb.c:1199: decode_string: Assertion
`strlen(buf) + strlen(p) + 1 <= buf_size' failed.
Aborted (core dumped)