heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
=================================================================
==33010==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6190000004e5 at pc 0x5618aeedc758 bp 0x7ffe61a1d410 sp 0x7ffe61a1d400
READ of size 1 at 0x6190000004e5 thread T0
    #0 0x5618aeedc757 in Get16u exif.c:325
    #1 0x5618aeef223e in ProcessGpsInfo gpsinfo.c:62
    #2 0x5618aeee54d5 in ProcessExifDir exif.c:866
    #3 0x5618aeee5529 in ProcessExifDir exif.c:852
    #4 0x5618aeee695a in process_EXIF exif.c:1041
    #5 0x5618aeed2382 in ReadJpegSections jpgfile.c:287
    #6 0x5618aeed390e in ReadJpegSections jpgfile.c:126
    #7 0x5618aeed390e in ReadJpegFile jpgfile.c:379
    #8 0x5618aeec966c in ProcessFile jhead.c:905
    #9 0x5618aeec4b2e in main jhead.c:1756
    #10 0x7f9cfffb1bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #11 0x5618aeec7279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x6190000004e5 is located 1 bytes to the right of 1124-byte region [0x619000000080,0x6190000004e4)
allocated by thread T0 here:
    #0 0x7f9d007fdb40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x5618aeed0d6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow exif.c:325 in Get16u
Shadow bytes around the buggy address:
  0x0c327fff8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c327fff8050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c327fff8060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c327fff8070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c327fff8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c327fff8090: 00 00 00 00 00 00 00 00 00 00 00 00[04]fa fa fa
  0x0c327fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c327fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c327fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c327fff80d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c327fff80e0: 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
==33010==ABORTING