[Bug 1545366] Re: out-of-bounds read in ImageMagick/coders/mat.c:406

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** Changed in: imagemagick
       Status: Unknown => Fix Released

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Title:
  out-of-bounds read in ImageMagick/coders/mat.c:406

Status in ImageMagick:
  Fix Released
Status in imagemagick package in Ubuntu:
  Fix Released

Bug description:
  This bug was found while fuzzing ImageMagick with afl-fuzz

  Tested on ImageMagick git commit <unknown>

  Command: magick id:000224,sig:06,src:004192+004496,op:splice,rep:128
  /dev/null

  =================================================================
  ==4438==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb48075b4 at pc 0x8596f01 bp 0xbfa1e608 sp 0xbfa1e600
  READ of size 4 at 0xb48075b4 thread T0
      #0 0x8596f00 in CalcMinMax /home/user/Desktop/FuzzImageMagick/ImageMagick/coders/mat.c:406
      #1 0x8588988 in ReadMATImage /home/user/Desktop/FuzzImageMagick/ImageMagick/coders/mat.c:939
      #2 0x8a60c98 in ReadImage /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/constitute.c:494
      #3 0x8a68b0f in ReadImages /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/constitute.c:844
      #4 0x92aee29 in CLINoImageOperator /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/operation.c:4680
      #5 0x92b7311 in CLIOption /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/operation.c:5174
      #6 0x904447d in ProcessCommandOptions /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/magick-cli.c:474
      #7 0x90477f5 in MagickImageCommand /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/magick-cli.c:786
      #8 0x904bcd9 in MagickCommandGenesis /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/mogrify.c:172
      #9 0x80de16d in MagickMain /home/user/Desktop/FuzzImageMagick/ImageMagick/utilities/magick.c:74
      #10 0x80de16d in main /home/user/Desktop/FuzzImageMagick/ImageMagick/utilities/magick.c:85
      #11 0xb74dda82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #12 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

  0xb48075b6 is located 0 bytes to the right of 54-byte region [0xb4807580,0xb48075b6)
  allocated by thread T0 here:
      #0 0x80c6bc1 in malloc (/usr/local/bin/magick+0x80c6bc1)
      #1 0x81888e9 in AcquireMagickMemory /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/memory.c:475
      #2 0x81888e9 in AcquireQuantumMemory /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/memory.c:548
      #3 0x8a60c98 in ReadImage /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/constitute.c:494
      #4 0x8a68b0f in ReadImages /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickCore/constitute.c:844
      #5 0x92aee29 in CLINoImageOperator /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/operation.c:4680
      #6 0x92b7311 in CLIOption /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/operation.c:5174
      #7 0x904447d in ProcessCommandOptions /home/user/Desktop/FuzzImageMagick/ImageMagick/MagickWand/magick-cli.c:474

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/FuzzImageMagick/ImageMagick/coders/mat.c:406 CalcMinMax
  Shadow bytes around the buggy address:
    0x36900e60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36900e70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36900e80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36900e90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36900ea0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  =>0x36900eb0: 00 00 00 00 00 00[06]fa fa fa fa fa 00 00 00 00
    0x36900ec0: 00 00 05 fa fa fa fa fa 00 00 00 00 00 00 05 fa
    0x36900ed0: fa fa fa fa fd fd fd fd fd fd fd fa fa fa fa fa
    0x36900ee0: fd fd fd fd fd fd fd fa fa fa fa fa 00 00 00 00
    0x36900ef0: 00 00 00 04 fa fa fa fa 00 00 00 00 00 00 00 04
    0x36900f00: 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
    ASan internal:         fe
  ==4438==ABORTING

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