[Bug tools/23754] New: NULL-Pointer dereference problem in function do_oper_extract in the eu-ar binaries

["wcventure at 126 dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23754

            Bug ID: 23754
           Summary: NULL-Pointer dereference problem in function
                    do_oper_extract in the eu-ar binaries
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: wcventure at 126 dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Hi,

Our fuzzer caught NULL-Pointer dereference problems in eu-ar.c in the latest
elfutils(v0.174) code base, those inputs will cause the signal SIGSEGV,
Segmentation fault. I have confirmed them with address sanitizer. 

Please use the “ ./eu-ar -tv $POC ” to reproduce the bug. If you have any
questions, please let me know. Thank you.

The ASAN dumps the stack trace as follows:

ASAN:DEADLYSIGNAL
=================================================================
==24906==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000030 (pc
0x7fb225ed3071 bp 0x7fffdbcb2a50 sp 0x7fffdbcb2370 T0)
==24906==The signal is caused by a READ memory access.
==24906==Hint: address points to the zero page.
    #0 0x7fb225ed3070  (/lib/x86_64-linux-gnu/libc.so.6+0xc3070)
    #1 0x7fb225ed50a5 in __strftime_l (/lib/x86_64-linux-gnu/libc.so.6+0xc50a5)
    #2 0x404574 in do_oper_extract
/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/src/ar.c:542
    #3 0x403203 in main
/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/src/ar.c:252
    #4 0x7fb225e3082f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #5 0x402428 in _start
(/mnt/c/wcventure/Fuzzing_Object/elfutils-0.174/build/bin/eu-ar+0x402428)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib/x86_64-linux-gnu/libc.so.6+0xc3070)
==24906==ABORTING

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