[Webkit-unassigned] [Bug 166617] New: WKWebView evaluateJavaScript: crash.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166617

            Bug ID: 166617
           Summary: WKWebView evaluateJavaScript: crash.
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: iOS 10
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: njaiswal at vera.com

Created attachment 297846
  --> https://bugs.webkit.org/attachment.cgi?id=297846&action=review
Image will show the backtrace of the crashing thread and backtrace before crash.

Scenario: While trying to evaluate javascript using "- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))completionHandler;" method. 

In result when i am trying to print the return value, the application crashes with below message.   

malloc: *** error for object 0x1704ae520: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

I am attaching the info image.

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