[Bug binutils/27794] New: [nm] heap-buffer-overflow in bfd.c:2389

[dkcjd2000 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27794

            Bug ID: 27794
           Summary: [nm] heap-buffer-overflow in bfd.c:2389
           Product: binutils
           Version: 2.37 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: dkcjd2000 at gmail dot com
  Target Milestone: ---

Created attachment 13406
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13406&action=edit
crash test case

Hello,
I report a heap buffer overflow detected by address sanitizer.
I found this test input by a fuzz testing.

The stack traces is as follows:
==6874==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c000000240
at pc 0x00000057b4f4 bp 0x7ffffff
fdaf0 sp 0x7fffffffd2b0
READ of size 2 at 0x60c000000240 thread T0
    #0 0x57b4f3 in strchr (.../afl++/subjects_friend/nm/nm.san+0x57b4f3)
    #1 0xe31a8e in bfd_demangle .../subjects/binutils-gdb/bfd/bfd.c:2389:9
    #2 0xe31775 in print_symname .../subjects/binutils-gdb/binutils/nm.c:456:15
    #3 0xe7f607 in print_symbol .../subjects/binutils-gdb/binutils/nm.c:968:3
    #4 0xe7ebe6 in print_symbols .../subjects/binutils-gdb/binutils/nm.c:1152:7
    #5 0xe7ebe6 in display_rel_file
.../subjects/binutils-gdb/binutils/nm.c:1279:5
    #6 0xe7cdde in display_file .../subjects/binutils-gdb/binutils/nm.c:1446:7
    #7 0xe7bfac in main .../subjects/binutils-gdb/binutils/nm.c:1965:12
    #8 0x7ffff6e22bf6 in __libc_start_main
/build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:310
    #9 0x5661a9 in _start (.../afl++/subjects_friend/nm/nm.san+0x5661a9)

You can reproduce the bug by executing
./nm -C <test input>

I tested the subject on the latest version uploaded on git,
build with --disable-shared --disable-gdb --disable-libdecnumber --disable-ld
--enable-targets=all
configure options.

Thanks

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