*** This bug is a security vulnerability ***

Public security bug reported:

=================================================================
==9817==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4303bcc at 
pc 0x8801f3a bp 0xbfadb6c8 sp 0xbfadb6c0
READ of size 1 at 0xb4303bcc thread T0
    #0 0x8801f39 in DecodeImage /home/user/Desktop/ImageMagick/coders/sun.c:173
    #1 0x8801f39 in ReadSUNImage /home/user/Desktop/ImageMagick/coders/sun.c:441
    #2 0x8a9438a in ReadImage 
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #3 0x8a9c1ff in ReadImages 
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #4 0x9371649 in CLINoImageOperator 
/home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #5 0x9379b31 in CLIOption 
/home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #6 0x910713d in ProcessCommandOptions 
/home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
    #7 0x910a4b5 in MagickImageCommand 
/home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
    #8 0x910e999 in MagickCommandGenesis 
/home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
    #9 0x80de12d in MagickMain 
/home/user/Desktop/ImageMagick/utilities/magick.c:74
    #10 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
    #11 0xb746fa82 in __libc_start_main 
/build/buildd/eglibc-2.19/csu/libc-start.c:287
    #12 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

0xb4303bcc is located 0 bytes to the right of 460-byte region 
[0xb4303a00,0xb4303bcc)
allocated by thread T0 here:
    #0 0x80c6b81 in malloc (/usr/local/bin/magick+0x80c6b81)
    #1 0x81932f9 in AcquireMagickMemory 
/home/user/Desktop/ImageMagick/MagickCore/memory.c:475
    #2 0x81932f9 in AcquireQuantumMemory 
/home/user/Desktop/ImageMagick/MagickCore/memory.c:548
    #3 0x8a9438a in ReadImage 
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #4 0x8a9c1ff in ReadImages 
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #5 0x9371649 in CLINoImageOperator 
/home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #6 0x9379b31 in CLIOption 
/home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #7 0x910713d in ProcessCommandOptions 
/home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474

SUMMARY: AddressSanitizer: heap-buffer-overflow 
/home/user/Desktop/ImageMagick/coders/sun.c:173 DecodeImage
Shadow bytes around the buggy address:
  0x36860720: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36860730: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36860740: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36860750: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36860760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x36860770: 00 00 00 00 00 00 00 00 00[04]fa fa fa fa fa fa
  0x36860780: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36860790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x368607a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x368607b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x368607c0: 00 00 00 00 00 00 00 00 00 00 00 00 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
==9817==ABORTING

** Affects: imagemagick (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1537417

Title:
  heap-buffer-overflow in coders/sun.c:173

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