imagemagick: memory allocation failure in AcquireMagickMemory (memory.c) (incomplete fix for CVE-2016-8862 and CVE-2016-8866)

Description:
imagemagick is a software suite to create, edit, compose, or convert bitmap images.

Another round of fuzzing pointed out that the memory allocation failure I discovered, known as CVE-2016-8862 and CVE-2016-8866 is still reproducible in the 7.0.4.9 version.
As usual, the upstream security policy are enabled.

The interesting part of the ASan stacktrace(not full because is a copy past of the one in the previous post):

# identify $FILE
    #8 0x7f2aeaea2812 in AcquireMagickMemory /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/memory.c:460:10
    #9 0x7f2aeaea2812 in AcquireVirtualMemory /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/memory.c:642
    #10 0x7f2ae32d941a in ReadPCXImage /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/coders/pcx.c:400:16
    #11 0x7f2aea9cdb26 in ReadImage /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/constitute.c:497:13
    #12 0x7f2aeb3a2df9 in ReadStream /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/stream.c:1013:9
    #13 0x7f2aea9cb3a6 in PingImage /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/constitute.c:226:9
    #14 0x7f2aea9cc2a6 in PingImages /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickCore/constitute.c:327:10
    #15 0x7f2ae97a6118 in IdentifyImageCommand /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickWand/identify.c:319:18
    #16 0x7f2ae98f800a in MagickCommandGenesis /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/MagickWand/mogrify.c:183:14
    #17 0x50a389 in MagickMain /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/utilities/magick.c:149:10
    #18 0x50a389 in main /tmp/portage/media-gfx/imagemagick-7.0.4.9/work/ImageMagick-7.0.4-9/utilities/magick.c:180
    #19 0x7f2ae7dda78f in __libc_start_main /tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
    #20 0x419da8 in _init (/usr/bin/magick+0x419da8)

Affected version:
7.0.4.9

Fixed version:
N/A

Commit fix:
N/A

Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
CVE-2017-7275

Timeline:
2017-02-19: bug re-discovered and re-reported upstream
2017-03-27: blog post about the issue
2017-03-27: CVE assigned

Note:
This bug was found with American Fuzzy Lop.

Permalink:
https://blogs.gentoo.org/ago/2016/03/27/imagemagick-memory-allocation-failure-in-acquiremagickmemory-memory-c-incomplete-fix-for-cve-2016-8862-and-cve-2016-8866

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