[Webkit-unassigned] [Bug 105218] New: [ANGLE] Use of uninitialized memory in ArrayBoundsClamper

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=105218

           Summary: [ANGLE] Use of uninitialized memory in
                    ArrayBoundsClamper
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mvujovic at adobe.com
                CC: dino at apple.com, achicu at adobe.com


TIntermBinary::addIndexClamp is uninitialized when the compile flag SH_CLAMP_INDIRECT_ARRAY_BOUNDS is not set. Then, addIndexClamp is used in OutputGLSLBase. CSS Shaders needs to do a first validation pass without the SH_CLAMP_INDIRECT_ARRAY_BOUNDS flag and its effects. However, sometimes addIndexClamp is true, which inserts clamping code that causes the a shader to fail compilation at the WebGL level.

Patch coming up.

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