heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
=================================================================
==16034==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000001a at pc 0x5630b528a3da bp 0x7ffe335d2de0 sp 0x7ffe335d2dd0
READ of size 2 at 0x60200000001a thread T0
    #0 0x5630b528a3d9 in Get16u exif.c:323
    #1 0x5630b528a3d9 in process_EXIF exif.c:1022
    #2 0x5630b5275382 in ReadJpegSections jpgfile.c:287
    #3 0x5630b527690e in ReadJpegSections jpgfile.c:126
    #4 0x5630b527690e in ReadJpegFile jpgfile.c:379
    #5 0x5630b526c66c in ProcessFile jhead.c:905
    #6 0x5630b5267b2e in main jhead.c:1756
    #7 0x7ff42b258bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #8 0x5630b526a279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x60200000001b is located 0 bytes to the right of 11-byte region [0x602000000010,0x60200000001b)
allocated by thread T0 here:
    #0 0x7ff42baa4b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x5630b5273d6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow exif.c:323 in Get16u
Shadow bytes around the buggy address:
  0x0c047fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c047fff8000: fa fa 00[03]fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: 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
==16034==ABORTING