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==30787==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x615000000280 at pc 0x00000050cad3 bp 0x7ffd4e4d7c70 sp 0x7ffd4e4d7c68
READ of size 4 at 0x615000000280 thread T0
    #0 0x50cad2 in dump /home/hongxu/tests/jsmn/example/jsondump.c:33:9
    #1 0x50ca00 in dump /home/hongxu/tests/jsmn/example/jsondump.c:46:9
    #2 0x50bed3 in main /home/hongxu/tests/jsmn/example/jsondump.c:120:4
    #3 0x7f8e2026b1c0 in __libc_start_main /build/glibc-itYbWN/glibc-2.26/csu/../csu/libc-start.c:308
    #4 0x41c5d9 in _start (/home/hongxu/tests/jsmn/jsondump+0x41c5d9)

0x615000000280 is located 0 bytes to the right of 512-byte region [0x615000000080,0x615000000280)
allocated by thread T0 here:
    #0 0x4d2045 in realloc (/home/hongxu/tests/jsmn/jsondump+0x4d2045)
    #1 0x50bdbc in realloc_it /home/hongxu/tests/jsmn/example/jsondump.c:15:12
    #2 0x50bdbc in main /home/hongxu/tests/jsmn/example/jsondump.c:113
    #3 0x7f8e2026b1c0 in __libc_start_main /build/glibc-itYbWN/glibc-2.26/csu/../csu/libc-start.c:308

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/hongxu/tests/jsmn/example/jsondump.c:33:9 in dump
Shadow bytes around the buggy address:
  0x0c2a7fff8000: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff8010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c2a7fff8020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c2a7fff8030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c2a7fff8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c2a7fff8050:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff8080: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff8090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c2a7fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==30787==ABORTING