[Webkit-unassigned] [Bug 246248] New: [GLib] JPEG2000 decoder may use garbage as alpha value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246248

            Bug ID: 246248
           Summary: [GLib] JPEG2000 decoder may use garbage as alpha value
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: sabouhallawa at apple.com

Caught by Clang with -Werror=conditional-uninitialized, inside JPEG2000Decoder::decode():

/app/webkit/Source/WebCore/platform/image-decoders/jpeg2000/JPEG2000ImageDecoder.cpp:546:56: error: variable 'a' may be uninitialized when used here [-Werror,-Wconditional-uninitialized]
            int adjustedAlpha = image->numcomps > 3 ? (a >> adjust[3]) + ((a >> (adjust[3] - 1)) % 2) : 0xFF;
                                                       ^
/app/webkit/Source/WebCore/platform/image-decoders/jpeg2000/JPEG2000ImageDecoder.cpp:506:27: note: initialize the variable 'a' to silence this warning
            int r, g, b, a;
                          ^
                           = 0
1 error generated.

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