[Bug binutils/20078] New: elf.c line 410 has no check for sh_link before accessing sections

[ecular at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20078

            Bug ID: 20078
           Summary: elf.c line 410 has no check for sh_link before
                    accessing sections
           Product: binutils
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: ecular at 163 dot com
  Target Milestone: ---

Created attachment 9254
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9254&action=edit
After running nm-new crash  it may case segment fault.

for (entry = elf_symtab_shndx_list (ibfd); entry != NULL; entry = entry->next)
if (sections[entry->hdr.sh_link] == symtab_hdr)
{
        shndx_hdr = & entry->hdr;
        break;
};

Before accessing sections[entry->hdr.sh_link], it has no size check for
hdr.sh_link. It may case Access Violation Fault.

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