[Bug binutils/28306] New: nm-new: null pointer dereference in bfd_getl16

[shaohua.li at inf dot ethz.ch]

https://sourceware.org/bugzilla/show_bug.cgi?id=28306

            Bug ID: 28306
           Summary: nm-new: null pointer dereference in bfd_getl16
           Product: binutils
           Version: 2.38 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

Created attachment 13650
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13650&action=edit
dereference_poc

Hi there,

I found a dereference error when fuzzing `nm-new -l`.

- Compiler: clang12
- Platform: Ubuntu 18.04.5 LTS, x86_64
- Reproduce: run `nm-new -l dereference_poc`

AddressSanitizer report:
==2940==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x000000503094 bp
0x7ffe3d636ff0 sp 0x7ffe3d636fb0 T0)
==2940==The signal is caused by a READ memory access.
==2940==Hint: this fault was caused by a dereference of a high value address
(see register values below).  Disassemble the provided pc to learn which
register was used.
    #0 0x503094 in bfd_getl16 /binutils_latest/repo/bfd/libbfd.c:633:11
    #1 0x9c15a1 in _bfd_mips_elf_reloc_unshuffle
/binutils_latest/repo/bfd/elfxx-mips.c:2359:11
    #2 0x9aec04 in mips16_gprel_reloc
/binutils_latest/repo/bfd/elf64-mips.c:3666:3
    #3 0x154b6b7 in bfd_perform_relocation
/binutils_latest/repo/bfd/reloc.c:711:14
    #4 0xa142f9 in _bfd_elf_mips_get_relocated_section_contents
/binutils_latest/repo/bfd/elfxx-mips.c:13362:10
    #5 0x4eaa6f in bfd_get_relocated_section_contents
/binutils_latest/repo/bfd/bfd.c:2166:10
    #6 0x1551708 in bfd_simple_get_relocated_section_contents
/binutils_latest/repo/bfd/simple.c:298:14
    #7 0x6aa68c in read_section /binutils_latest/repo/bfd/./dwarf2.c:582:7
    #8 0x6a7327 in _bfd_dwarf2_slurp_debug_info
/binutils_latest/repo/bfd/./dwarf2.c:4737:13
    #9 0x6ab8b1 in _bfd_dwarf2_find_nearest_line
/binutils_latest/repo/bfd/./dwarf2.c:4985:9
    #10 0x5d0226 in _bfd_elf_find_line /binutils_latest/repo/bfd/elf.c:9234:10
    #11 0x4d1ba0 in print_symbol /binutils_latest/repo/binutils/nm.c:1071:9
    #12 0x4ceaeb in print_symbols /binutils_latest/repo/binutils/nm.c:1152:7
    #13 0x4cd23c in display_rel_file /binutils_latest/repo/binutils/nm.c:1279:5
    #14 0x4c97dd in display_file /binutils_latest/repo/binutils/nm.c:1446:7
    #15 0x4c90db in main /binutils_latest/repo/binutils/nm.c:1965:12
    #16 0x7f94667460b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #17 0x41c55d in _start (/out_bin/nm-new+0x41c55d)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /binutils_latest/repo/bfd/libbfd.c:633:11 in
bfd_getl16
==2940==ABORTING

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