[Bug binutils/21416] New: readelf segfault - null pointer dereferencing

[dungnguy at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=21416

            Bug ID: 21416
           Summary: readelf segfault - null pointer dereferencing
           Product: binutils
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: dungnguy at comp dot nus.edu.sg
  Target Milestone: ---

Created attachment 10013
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10013&action=edit
Crashing input

Dear All,

This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also
to Marcel Böhme and Van-Thuan Pham.

This bug was found on Ubuntu 14.04 64-bit & binutils was checked out from main
repository at git://sourceware.org/git/binutils-gdb.git. Its commit is
a6c21d4a553de184562fd8409a5bcd3f2cc2561a (Wed Apr 19 13:16:05 2017).

binutils was built with ASAN using gcc-6.2 and clang-3.4. The configure command
was:

CC=clang CFLAGS="-DFORTIFY_SOURCE=2 -fstack-protector-all
-fsanitize=undefined,address -fno-omit-frame-pointer -g -Wno-error"
../configure --disable-shared --disable-gdb --disable-libdecnumber
--disable-readline --disable-sim

To reproduce:
Download the attached file - bug_14
readelf -wL bug_14

ASAN says:
==148446==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x000000762d96 bp 0x7ffc66657190 sp 0x7ffc66655580 T0)
    #0 0x762d95 in display_debug_lines_decoded
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/dwarf.c:3813:8
    #1 0x6c20a1 in display_debug_lines
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/dwarf.c:4195:21
    #2 0x5ae843 in display_debug_section
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/readelf.c:13299:16
    #3 0x51ede8 in process_section_contents
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/readelf.c:13385:10
    #4 0x4c99cb in process_object
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/readelf.c:17682:9
    #5 0x4c46f0 in process_file
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/readelf.c:18074:13
    #6 0x4c258a in main
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/readelf.c:18146:11
    #7 0x7f5ab05c4f44 in __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287
    #8 0x4bae9c in _start
(/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/readelf+0x4bae9c)

VALGRIND says:
==148448== Invalid read of size 8
==148448==    at 0x44686A: display_debug_lines_decoded (dwarf.c:3813)
==148448==    by 0x4479CF: display_debug_lines (dwarf.c:4195)
==148448==    by 0x42D4D3: display_debug_section (readelf.c:13299)
==148448==    by 0x42D7BF: process_section_contents (readelf.c:13385)
==148448==    by 0x437F14: process_object (readelf.c:17682)
==148448==    by 0x438E37: process_file (readelf.c:18074)
==148448==    by 0x438FDF: main (readelf.c:18146)
==148448==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==148448== 
==148448== 
==148448== Process terminating with default action of signal 11 (SIGSEGV)
==148448==  Access not within mapped region at address 0x0
==148448==    at 0x44686A: display_debug_lines_decoded (dwarf.c:3813)
==148448==    by 0x4479CF: display_debug_lines (dwarf.c:4195)
==148448==    by 0x42D4D3: display_debug_section (readelf.c:13299)
==148448==    by 0x42D7BF: process_section_contents (readelf.c:13385)
==148448==    by 0x437F14: process_object (readelf.c:17682)
==148448==    by 0x438E37: process_file (readelf.c:18074)
==148448==    by 0x438FDF: main (readelf.c:18146)

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