[Webkit-unassigned] [Bug 154149] New: JPEG has random/garbled data for last few columns

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154149

            Bug ID: 154149
           Summary: JPEG has random/garbled data for last few columns
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit.org at ricciadams.com

When I load the attached JPEG in Safari 9.0.3 (or WebKit nightly) on my iMac, the last few columns of pixels decode incorrectly.  This only occurs on my iMac (Retina 5K, 27-inch, Late 2014) running 10.11.3.  It does not occur on any other device that I own (I tested multiple iOS devices, my MacBook Pro, and my housemate's iMacs).

Attached is a movie of me reloading the JPEG in question.  Notice that the last column changes randomly.

Other JPEGs do not exhibit this behavior, it may only occur when the width is 666 pixels and the color space is Grayscale.  I vaguely recall running all of my images through an optimizer, so it's possible that the JPEG itself is invalid (I still wanted to file, however, in case this is exposing a memory issue in the decoder).

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