[Bug binutils/30949] New: A potential bug of null pointer dereference

[a860641231 at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30949

            Bug ID: 30949
           Summary: A potential bug of null pointer dereference
           Product: binutils
           Version: 2.42 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: a860641231 at 163 dot com
  Target Milestone: ---

Created attachment 15157
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15157&action=edit
contain image describing the source code of potentical npd

Hi, I found a potential null pointer dereference bug in the binutils project
source code of bfd, and I have shown the execution sequence of the program that
may generate the bug on the graph below. The red text illustrates the reason
that generate the bug, that is , variable isec receives the return value from
function bfd_section_from_elf_index(which may be null value) and is
dereferenced at line 12973 without checking isec is null or not.  

In another call site(elf64-ppc.c), as in many others, variable sec receives the
return value from function bfd_section_from_elf_index ,and check sec is null or
not before deference of variable sec.

Although the code shown is for version 2.32 but this potential bug is still
exist in the current version.
would you can help to check if this bug is true? thank you for your effort and
patience!

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