heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
=================================================================
==34259==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x611000000106 at pc 0x55e0a14147a5 bp 0x7ffcd8d72e80 sp 0x7ffcd8d72e70
READ of size 1 at 0x611000000106 thread T0
    #0 0x55e0a14147a4 in show_IPTC iptc.c:136
    #1 0x55e0a13ec8bb in ProcessFile jhead.c:955
    #2 0x55e0a13e7b2e in main jhead.c:1756
    #3 0x7fa81c777bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #4 0x55e0a13ea279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x611000000106 is located 0 bytes to the right of 198-byte region [0x611000000040,0x611000000106)
allocated by thread T0 here:
    #0 0x7fa81cfc3b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x55e0a13f3d6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow iptc.c:136 in show_IPTC
Shadow bytes around the buggy address:
  0x0c227fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c227fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c227fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c227fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c227fff8010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c227fff8020:[06]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c227fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c227fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c227fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c227fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c227fff8070: 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
==34259==ABORTING