ASAN stack buffer overflow in test suite

[lorenz]

With asan the test suite crashes with the following ASAN error. It looks like the 22 seq entries overflow.

Version: 0.23.92

/build/source/test/test_decode -q -n 100000
=================================================================
==8400==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffffff8e58 at pc 0x7ffff7f6548b bp 0x7fffffff8c70 sp 0x7fffffff8c68
WRITE of size 4 at 0x7fffffff8e58 thread T0
    #0 0x7ffff7f6548a in lookup_sequence decoder/databar.c:698
    #1 0x7ffff7f677bd in match_segment_exp decoder/databar.c:758
    #2 0x7ffff7f687fa in decode_char decoder/databar.c:1081
    #3 0x7ffff7f68d42 in decode_finder decoder/databar.c:1217
    #4 0x7ffff7f69089 in _zbar_decode_databar decoder/databar.c:1237
    #5 0x7ffff7f5ff31 in zbar_decode_width /build/source/zbar/decoder.c:274
    #6 0x404367 in encode_junk test/test_decode.c:172
    #7 0x407799 in test_numeric test/test_decode.c:1176
    #8 0x407cfe in test1 test/test_decode.c:1290
    #9 0x4080c6 in main test/test_decode.c:1346
    #10 0x7ffff7449acd in __libc_start_call_main (/nix/store/ibp4camsx1mlllwzh32yyqcq2r2xsy1a-glibc-2.37-8/lib/libc.so.6+0x23acd)
    #11 0x7ffff7449b88 in __libc_start_main_alias_2 (/nix/store/ibp4camsx1mlllwzh32yyqcq2r2xsy1a-glibc-2.37-8/lib/libc.so.6+0x23b88)
    #12 0x402334 in _start (/build/source/test/.libs/lt-test_decode+0x402334)

Address 0x7fffffff8e58 is located in stack of thread T0 at offset 376 in frame
    #0 0x7ffff7f670a8 in match_segment_exp decoder/databar.c:709

  This frame has 4 object(s):
    [32, 120) 'bestsegs' (line 711)
    [160, 248) 'segs' (line 711)
    [288, 376) 'seq' (line 711) <== Memory access at offset 376 overflows this variable
    [416, 544) 'iseg' (line 713)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow decoder/databar.c:698 in lookup_sequence
Shadow bytes around the buggy address:
  0x10007fff7170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7190: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
  0x10007fff71a0: 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
  0x10007fff71b0: 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
=>0x10007fff71c0: 00 00 00 00 00 00 00 00 00 00 00[f2]f2 f2 f2 f2
  0x10007fff71d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff71e0: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff71f0: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
  0x10007fff7200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007fff7210: 00 00 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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==8400==ABORTING