Open Radar

 
Summary:
My UIWebView shows a login page. The app crashed while UIWebView doing spell check on username field. I am not sure how the spell check started. Please find the stacktrace below - 

"StackTrace" : [
        "#0  MyApp                               0X00000001001A4AB4 +[Logging signalHandler:]",
        "#1  MyApp                               0X000000010017CD8C -[NSURL portByScheme]",
        "#2  libsystem_platform.dylib            0X000000019817C95C _sigtramp()",
        "#3  ProofReader                         0X0000000191FB8B34 ICspl()",
        "#4  ProofReader                         0X0000000191FB8B34 ICspl()",
        "#5  ProofReader                         0X0000000191FB77A4 PRIcs()",
        "#6  ProofReader                         0X0000000191FBEF20 PRword()",
        "#7  ProofReader                         0X0000000191FBEACC -[AppleSpell validateWordBuffer:length:connection:]",
        "#8  ProofReader                         0X0000000191FD0B50 -[AppleSpell validateWordBuffer:length:language:connection:sender:checkBase:checkDict:checkTemp:checkUser:checkNames:checkHyphens:checkIntercaps:checkOptions:depth:]",
        "#9  ProofReader                         0X0000000191FBDA6C -[AppleSpell validateWordBuffer:length:language:connection:sender:checkBase:checkDict:checkTemp:checkNames:checkHyphens:checkIntercaps:checkOptions:depth:]",
        "#10 ProofReader                         0X0000000191FB3618 -[AppleSpell spellServer:findMisspelledWordInString:range:languages:topLanguages:orthography:checkOrthography:mutableResults:offset:autocorrect:keyEventData:appIdentifier:wordCount:countOnly:correction:]",
        "#11 ProofReader                         0X0000000191FB2930 -[AppleSpell spellServer:findMisspelledWordInString:language:wordCount:countOnly:correction:]",
        "#12 UIKit                               0X000000018A9001EC -[UITextChecker _chunkAndFindMisspelledWordInString:language:learnedDictionaries:wordCount:correction:usingChecker:]",
        "#13 UIKit                               0X000000018A8FFDD8 -[UITextChecker checkSpellingOfString:startingAt:language:wrap:correction:]",
        "#14 UIKit                               0X000000018A8FFAAC -[UITextChecker rangeOfMisspelledWordInString:range:startingAt:wrap:language:]",
        "#15 UIKit                               0X000000018A9630C0 -[UIWebDocumentView checkSpellingOfString:]",
        "#16 CoreFoundation                      0X0000000185CB6050 <redacted>()",
        "#17 CoreFoundation                      0X0000000185BB1F9C -[NSInvocation invoke]",
        "#18 CoreFoundation                      0X0000000185BB6AD0 -[NSInvocation invokeWithTarget:]",
        "#19 WebKitLegacy                        0X0000000195909488 -[_WebSafeForwarder forwardInvocation:]",
        "#20 CoreFoundation                      0X0000000185CB3EC0 <redacted>()",
        "#21 CoreFoundation                      0X0000000185BB696C _CF_forwarding_prep_0()",
        "#22 CoreFoundation                      0X0000000185CB6050 <redacted>()",
        "#23 CoreFoundation                      0X0000000185BB1F9C -[NSInvocation invoke]",
        "#24 WebCore                             0X0000000194AADA60 <redacted>()",
        "#25 CoreFoundation                      0X0000000185C67F8C <redacted>()",
        "#26 CoreFoundation                      0X0000000185C67230 <redacted>()",
        "#27 CoreFoundation                      0X0000000185C652E0 <redacted>()",
        "#28 CoreFoundation                      0X0000000185B90F74 CFRunLoopRunSpecific()",
        "#29 GraphicsServices                    0X000000018F5F36FC GSEventRunModal()",
        "#30 UIKit                               0X000000018A792D94 UIApplicationMain()",
        "#31 CareAwareConnect                    0X000000010013CA1C -[LocationsRetriever .cxx_destruct]",
        "#32 libdyld.dylib                       0X0000000197FCEA08 <redacted>()"
      ]

Steps to Reproduce:
1) Launch an app with UIWebView showing some input field.
2) Try entering some miss-spelled word on input filed. Make sure its doing spell check.
3) The app will crash.

Expected Results:
The app shouldn't crash.

Actual Results:
The app crashed with SIGSEGV - segmentation violation in [AppleSpell validateWordBuffer:length:connection:].

Version:
iPhone OS Version 8.4.1 (Build 12H321)

Configuration:
iPhone 5s using WiFi