[Bug binutils/24001] New: A memory leak issue was discovered in function debug_init in debug.c

[wcventure at 126 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24001

            Bug ID: 24001
           Summary: A memory leak issue was discovered in function
                    debug_init in debug.c
           Product: binutils
           Version: 2.31
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: wcventure at 126 dot com
  Target Milestone: ---

Created attachment 11468
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11468&action=edit
POC1

Hi there,

A memory leak issue was discovered in debug.c, as distributed in GNU Binutils
2.31. 
In debug_init function in debug.c, the is a heap allocation. But this heap
allocation didn't deallocate in the end. The source Code show as follow.

> void *
> debug_init (void)
> {
>   struct debug_handle *ret;
> 
>   ret = (struct debug_handle *) xmalloc (sizeof *ret);
>   memset (ret, 0, sizeof *ret);
>   return (void *) ret;
> }

Please use the "./objdump -xg $POC" to reproduce the bug.
To reproduce this bug. You need to build bintuils-2.31 with ASAN, setting
following Command:

> export ASAN_OPTIONS=abort_on_error=1:symbolize=1:detect_leaks=1


The Leak Sanitizer dumps the stack trace as follows:

> =================================================================
> ==12163==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 96 byte(s) in 1 object(s) allocated from:
>     #0 0x7fcb75396602 in malloc 
> (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
>     #1 0x8f925b in xmalloc xmalloc.c:147
>     #2 0x4734b9 in debug_init /binutils-2.31_ASAN/binutils/debug.c:666
>     #3 0x47014b in read_debugging_info /binutils-2.31_ASAN/binutils/rddbg.c:51
>     #4 0x41e02c in dump_bfd objdump.c:3637
>     #5 0x41e30e in display_object_bfd objdump.c:3688
>     #6 0x41e89c in display_any_bfd objdump.c:3777
>     #7 0x41e936 in display_file objdump.c:3798
>     #8 0x41fb25 in main objdump.c:4100
>     #9 0x7fcb7404382f in __libc_start_main 
> (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
> 
> SUMMARY: AddressSanitizer: 96 byte(s) leaked in 1 allocation(s).

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