[Bug binutils/25840] New: Null pointer dereference in objdump

[nguyenmanhdung1710 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25840

            Bug ID: 25840
           Summary: Null pointer dereference in objdump
           Product: binutils
           Version: 2.35 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: nguyenmanhdung1710 at gmail dot com
  Target Milestone: ---

Created attachment 12472
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12472&action=edit
PoC

Hi,

A null pointer dereference was discovered in objdump (the latest commit
8e4979a) in debug_get_real_type(), that can cause a denial of service via a
crafted file.

To reproduce: objdump -g PoC

ASAN says:
==6516==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x000000462b53 bp 0x7ffc368a4570 sp 0x7ffc368a44c0 T0)
    #0 0x462b52 in debug_get_real_type ../../binutils/debug.c:2038
    #1 0x46bc41 in debug_class_type_samep ../../binutils/debug.c:3280
    #2 0x469b12 in debug_type_samep ../../binutils/debug.c:3088
    #3 0x468dac in debug_set_class_id ../../binutils/debug.c:2970
    #4 0x465370 in debug_write_type ../../binutils/debug.c:2505
    #5 0x465c7e in debug_write_type ../../binutils/debug.c:2554
    #6 0x4658d3 in debug_write_type ../../binutils/debug.c:2536
    #7 0x465c7e in debug_write_type ../../binutils/debug.c:2554
    #8 0x466b3d in debug_write_type ../../binutils/debug.c:2649
    #9 0x46424d in debug_write_name ../../binutils/debug.c:2378
    #10 0x463feb in debug_write ../../binutils/debug.c:2350
    #11 0x452a41 in print_debugging_info ../../binutils/prdbg.c:319
    #12 0x4184ce in dump_bfd ../../binutils/objdump.c:4897
    #13 0x418701 in display_object_bfd ../../binutils/objdump.c:4950
    #14 0x418a09 in display_any_bfd ../../binutils/objdump.c:5040
    #15 0x418a7e in display_file ../../binutils/objdump.c:5061
    #16 0x419d4c in main ../../binutils/objdump.c:5407
    #17 0x7fa59a0c182f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #18 0x403418 in _start
(/home/dungnguyen/PoCs/binutils_f717994/objdump-asan+0x403418)

Thanks,
Manh Dung

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