[Webkit-unassigned] [Bug 200388] New: a null pointer deref in DFGCFGSimplificationPhase.cpp

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200388

            Bug ID: 200388
           Summary: a null pointer deref in DFGCFGSimplificationPhase.cpp
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhunkibatu at gmail.com

the following poc can trigger an null pointer deref in DFGCFGSimplificationPhase.cpp




function foo(x) {
        switch (x) {
                case "a":
                case "a":
                case "a":
                        for (let j = 0; j <100; j++) {
                                let j=foo(j);
                        }
                default:
                        return 2;
        }
}


for (let i = 0; i <100000; i++) {
    foo("ab");
}

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