Author: sebastienlc
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src//+/5d00eed502e7f79e537b096ef86f9cfe82a732df
Time: Tue Jun 21 20:41:16 2016
The CL last changed line 1199 of file BaseRenderingContext2D.cpp, which is stack frame 4.

Suspected Project: chromium
Suspected Component: Blink>HTML

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/29622ffb0f2116f242bcddb38aec7a9100dda7ea

commit 29622ffb0f2116f242bcddb38aec7a9100dda7ea
Author: xidachen <xidachen@chromium.org>
Date: Thu Jul 21 18:35:56 2016

Fix integer over flow issue in HTMLCanvasElement::canCreateImageBuffer

Right now in this method, it does a size.width() * size.height(), and
that could cause integer overflow.

This CL fix that by using CheckedNumeric<int>.

BUG= 630024 

Review-Url: https://codereview.chromium.org/2170693003
Cr-Commit-Position: refs/heads/master@{#406914}

[modify] https://crrev.com/29622ffb0f2116f242bcddb38aec7a9100dda7ea/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

ClusterFuzz has detected this issue as fixed in range 406906:406944.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4825458961285120

Fuzzer: inferno_twister
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Integer-overflow
Crash Address: 
Crash State:
  blink::canCreateImageBuffer
  blink::HTMLCanvasElement::isPaintable
  blink::HTMLCanvasElement::getSourceImageForCanvas
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=370022:370027
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_ubsan_chrome&range=406906:406944

Minimized Testcase (0.27 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv95IS-R88kE60LmVPp-yyygzpF9PXlu7zZ6ZVNGVPFk2Cgl5J8dGWsNVoGS9MQxsehF6GLJ4Pje0-5tGrGp_QQUdm_M2i4p_6QJvT4HH8Ahdg6nTymQuqOrFvw30a1-3z1HS4JnnfUxN6rolJ0d0MRoNqQx69A?testcase_id=4825458961285120
<script>
var canvas = document.createElement("canvas");
var patternCanvas = document.createElement("canvas");
patternCanvas.width = 300000;
patternCanvas.height = 300000;
var ctx = canvas.getContext("2d");
    pattern = ctx.createPattern(patternCanvas, "repeat");
</script>


Additional requirements: Requires HTTP

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