heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
==6757==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x612000000144 at pc 0x56033e019b38 bp 0x7ffe9162eb20 sp 0x7ffe9162eb10
READ of size 1 at 0x612000000144 thread T0
    #0 0x56033e019b37 in process_DQT jpgqguess.c:111
    #1 0x56033e0128e2 in ReadJpegSections jpgfile.c:223
    #2 0x56033e01490e in ReadJpegSections jpgfile.c:126
    #3 0x56033e01490e in ReadJpegFile jpgfile.c:379
    #4 0x56033e00a66c in ProcessFile jhead.c:905
    #5 0x56033e005b2e in main jhead.c:1756
    #6 0x7f5889de2bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #7 0x56033e008279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x612000000144 is located 0 bytes to the right of 260-byte region [0x612000000040,0x612000000144)
allocated by thread T0 here:
    #0 0x7f588a62eb40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x56033e011d6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow jpgqguess.c:111 in process_DQT
Shadow bytes around the buggy address:
  0x0c247fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c247fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c247fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c247fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c247fff8010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c247fff8020: 00 00 00 00 00 00 00 00[04]fa fa fa fa fa fa fa
  0x0c247fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff8070: 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
==6757==ABORTING