[Webkit-unassigned] [Bug 64802] New: Custom cursors cause the WebProcess to crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64802

           Summary: Custom cursors cause the WebProcess to crash
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: amruthraj at motorola.com


With https://bugs.webkit.org/show_bug.cgi?id=64321 there can be a custom Cursor object with an empty Image.
Encoding them would lead to a crash since a ShareableBitmap of size 0 would be requested. This returns a NULL and causes a crash.

#0  0x00007f141d5ee05a in WebCore::IntSize::width (this=0x8) at ../../Source/WebCore/platform/graphics/IntSize.h:67
#1  0x00007f141d6051ca in WebKit::ShareableBitmap::createCairoSurface (this=0x0) at ../../Source/WebKit2/Shared/cairo/ShareableBitmapCairo.cpp:69
#2  0x00007f141d604ec9 in WebKit::ShareableBitmap::createGraphicsContext (this=0x0) at ../../Source/WebKit2/Shared/cairo/ShareableBitmapCairo.cpp:43
#3  0x00007f141d622f51 in CoreIPC::encodeImage (encoder=0x23a8650, image=0x23c3c50) at ../../Source/WebKit2/Shared/WebCoreArgumentCoders.cpp:294

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