A heap overflow in aclosslessscan.cpp:349 causes segment fault

[seviezhou]

System info

Ubuntu X64, gcc (Ubuntu 5.5.0-12ubuntu1), jpeg (latest master e52406)

Command line

./jpeg -oz -h -s 1x1,2x2,2x2 @@ /dev/null

Output

*** Warning -1038 in Frame::ParseTrailer, line 1083, file frame.cpp
*** Reason is: missing an EOI marker at the end of the stream

*** Warning -1038 in Image::ParseTrailer, line 1464, file image.cpp
*** Reason is: expecting an EOI marker at the end of the stream

Segmentation fault

AddressSanitizer output

=================================================================
==74952==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61a00001f774 at pc 0x0000004f2c69 bp 0x7ffcf95a51b0 sp 0x7ffcf95a51a0
READ of size 4 at 0x61a00001f774 thread T0
    #0 0x4f2c68 in ACLosslessScan::ParseMCU(Line**, Line**) /home/seviezhou/libjpeg/codestream/aclosslessscan.cpp:349
    #1 0x4f3385 in ACLosslessScan::ParseMCU() /home/seviezhou/libjpeg/codestream/aclosslessscan.cpp:471
    #2 0x45c4b4 in JPEG::ReadInternal(JPG_TagItem*) /home/seviezhou/libjpeg/interface/jpeg.cpp:345
    #3 0x45d5be in JPEG::Read(JPG_TagItem*) /home/seviezhou/libjpeg/interface/jpeg.cpp:210
    #4 0x42adbf in Reconstruct(char const*, char const*, int, char const*, bool) /home/seviezhou/libjpeg/cmd/reconstruct.cpp:121
    #5 0x4055f0 in main /home/seviezhou/libjpeg/cmd/main.cpp:718
    #6 0x7f2ee6e9783f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #7 0x409da8 in _start (/home/seviezhou/libjpeg/jpeg+0x409da8)

0x61a00001f774 is located 0 bytes to the right of 1268-byte region [0x61a00001f280,0x61a00001f774)
allocated by thread T0 here:
    #0 0x7f2ee79c5602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x44cadf in Environ::CoreAllocMem(unsigned int, unsigned int) /home/seviezhou/libjpeg/tools/environment.cpp:664
    #2 0x4ef428 in ACLosslessScan::FindComponentDimensions() /home/seviezhou/libjpeg/codestream/aclosslessscan.cpp:130
    #3 0x4ef63c in ACLosslessScan::StartParseScan(ByteStream*, Checksum*, BufferCtrl*) /home/seviezhou/libjpeg/codestream/aclosslessscan.cpp:143
    #4 0x533499 in Frame::StartParseScan(ByteStream*, Checksum*) /home/seviezhou/libjpeg/marker/frame.cpp:847
    #5 0x45bec4 in JPEG::ReadInternal(JPG_TagItem*) /home/seviezhou/libjpeg/interface/jpeg.cpp:296
    #6 0x45d5be in JPEG::Read(JPG_TagItem*) /home/seviezhou/libjpeg/interface/jpeg.cpp:210
    #7 0x42adbf in Reconstruct(char const*, char const*, int, char const*, bool) /home/seviezhou/libjpeg/cmd/reconstruct.cpp:121
    #8 0x4055f0 in main /home/seviezhou/libjpeg/cmd/main.cpp:718
    #9 0x7f2ee6e9783f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/seviezhou/libjpeg/codestream/aclosslessscan.cpp:349 ACLosslessScan::ParseMCU(Line**, Line**)
Shadow bytes around the buggy address:
  0x0c347fffbe90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbeb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c347fffbee0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[04]fa
  0x0c347fffbef0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf30: 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
==74952==ABORTING

POC

heap-overflow-ParseMCU-aclosslessscan-349.zip

[thorfdbg]

No longer applies, closed as part of another bug, and fixed there.

[xteema]

Is this fixed by the commit https://github.com/thorfdbg/libjpeg/commit/97e99771b71ad295cd9aa6ef5f221e002b9b0574