heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
=================================================================
==16178==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000041 at pc 0x55e36403d542 bp 0x7ffefe4763e0 sp 0x7ffefe4763d0
READ of size 1 at 0x602000000041 thread T0
    #0 0x55e36403d541 in ProcessExifDir exif.c:727
    #1 0x55e36404195a in process_EXIF exif.c:1041
    #2 0x55e36402d382 in ReadJpegSections jpgfile.c:287
    #3 0x55e36402e90e in ReadJpegSections jpgfile.c:126
    #4 0x55e36402e90e in ReadJpegFile jpgfile.c:379
    #5 0x55e36402466c in ProcessFile jhead.c:905
    #6 0x55e36401fb2e in main jhead.c:1756
    #7 0x7fdc5b5cdbf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #8 0x55e364022279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x602000000041 is located 1 bytes to the right of 16-byte region [0x602000000030,0x602000000040)
allocated by thread T0 here:
    #0 0x7fdc5be19b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x55e36402bd6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow exif.c:727 in ProcessExifDir
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 fd fd fa fa 00 00[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
==16178==ABORTING