heap-buffer-overflow in jpgfile.c:51 process_COM

[Fstark]

fuzz1:id:000000,sig:06,src:000023,time:610,op:flip1,pos:23
=================================================================
==29731==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000eff4 at pc 0x00000040e11b bp 0x7ffde2ec58c0 sp 0x7ffde2ec58b0
READ of size 1 at 0x60200000eff4 thread T0
    #0 0x40e11a in process_COM /home/fstark/jhead/jpgfile.c:51
    #1 0x40f78f in ReadJpegSections /home/fstark/jhead/jpgfile.c:240
    #2 0x410e86 in ReadJpegSections /home/fstark/jhead/jpgfile.c:125
    #3 0x410e86 in ReadJpegFile /home/fstark/jhead/jpgfile.c:378
    #4 0x40858b in ProcessFile /home/fstark/jhead/jhead.c:905
    #5 0x402f2c in main /home/fstark/jhead/jhead.c:1756
    #6 0x7f003e17983f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #7 0x406708 in _start (/home/fstark/jhead/jhead+0x406708)

0x60200000eff4 is located 0 bytes to the right of 4-byte region [0x60200000eff0,0x60200000eff4)
allocated by thread T0 here:
    #0 0x7f003e8c4602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x40e4a8 in ReadJpegSections /home/fstark/jhead/jpgfile.c:172

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/fstark/jhead/jpgfile.c:51 process_COM
Shadow bytes around the buggy address:
  0x0c047fff9da0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9db0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9dc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9dd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9de0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fff9df0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa[04]fa
  0x0c047fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff9e40: 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
  Heap right redzone: fb
  Freed heap region: fd
  Stack left redzone: f1
  Stack mid redzone: f2
  Stack right redzone: f3
  Stack partial redzone: f4
  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
==29731==ABORTING