[Bug tools/23247] New: Segfault in 0.171 RC1 release candidate

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=23247

            Bug ID: 23247
           Summary: Segfault in 0.171 RC1 release candidate
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Created attachment 11047
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11047&action=edit
test-case

I've just built elftuils with GCC 8.1.0 and I see:

$ LD_LIBRARY_PATH=./libdw/ ./src/readelf -a -w ./backends/libebl_x86_64.so
[snip]
DWARF section [32] '.debug_loc' at offset 0x2fbd9:

 CU [    2d] base: +0x0000000000001e60 <x86_64_reloc_type_name>
Segmentation fault (core dumped)

Valgrind tells:

DWARF section [32] '.debug_loc' at offset 0x2fbd9:

 CU [    2d] base: +0x0000000000001e60 <x86_64_reloc_type_name>
==19867== Invalid read of size 8
==19867==    at 0x41EC14: next_listptr_offset (readelf.c:4939)
==19867==    by 0x41EC14: print_debug_loc_section (readelf.c:9247)
==19867==    by 0x4122D8: print_debug (readelf.c:11075)
==19867==    by 0x415610: process_elf_file (readelf.c:980)
==19867==    by 0x41631C: process_dwflmod (readelf.c:744)
==19867==    by 0x4E62020: dwfl_getmodules (dwfl_getmodules.c:86)
==19867==    by 0x40883B: process_file (readelf.c:852)
==19867==    by 0x4044C3: main (readelf.c:338)
==19867==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==19867== 
==19867== 
==19867== Process terminating with default action of signal 11 (SIGSEGV):
dumping core
==19867==  Access not within mapped region at address 0x0
==19867==    at 0x41EC14: next_listptr_offset (readelf.c:4939)
==19867==    by 0x41EC14: print_debug_loc_section (readelf.c:9247)
==19867==    by 0x4122D8: print_debug (readelf.c:11075)
==19867==    by 0x415610: process_elf_file (readelf.c:980)
==19867==    by 0x41631C: process_dwflmod (readelf.c:744)
==19867==    by 0x4E62020: dwfl_getmodules (dwfl_getmodules.c:86)
==19867==    by 0x40883B: process_file (readelf.c:852)
==19867==    by 0x4044C3: main (readelf.c:338)
==19867==  If you believe this happened as a result of a stack
==19867==  overflow in your program's main thread (unlikely but
==19867==  possible), you can try to increase the size of the
==19867==  main thread stack using the --main-stacksize= flag.
==19867==  The main thread stack size used in this run was 8388608.

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