heap overflow

[XiaoyuHe]

# enviroment
ubuntu 18.04
./jhead poc

# version
3.04

# asan out
=================================================================
==34474==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x611000000105 at pc 0x55c0c7b01959 bp 0x7ffed8858130 sp 0x7ffed8858120
READ of size 1 at 0x611000000105 thread T0
    #0 0x55c0c7b01958 in process_COM jpgfile.c:51
    #1 0x55c0c7b03399 in ReadJpegSections jpgfile.c:241
    #2 0x55c0c7b0490e in ReadJpegSections jpgfile.c:126
    #3 0x55c0c7b0490e in ReadJpegFile jpgfile.c:379
    #4 0x55c0c7afa66c in ProcessFile jhead.c:905
    #5 0x55c0c7af5b2e in main jhead.c:1756
    #6 0x7f00f9f2dbf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #7 0x55c0c7af8279 in _start (/home/fuzz/jhead-3.04/jhead+0x12279)

0x611000000105 is located 0 bytes to the right of 197-byte region [0x611000000040,0x611000000105)
allocated by thread T0 here:
    #0 0x7f00fa779b40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x55c0c7b01d6b in ReadJpegSections jpgfile.c:173

SUMMARY: AddressSanitizer: heap-buffer-overflow jpgfile.c:51 in process_COM
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:[05]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
==34474==ABORTING