23235185: App crashed while UIWebView doing spell check

[openradar-mirror]

Description

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 ()",
"#17 CoreFoundation 0X0000000185BB1F9C -[NSInvocation invoke]",
"#18 CoreFoundation 0X0000000185BB6AD0 -[NSInvocation invokeWithTarget:]",
"#19 WebKitLegacy 0X0000000195909488 -[_WebSafeForwarder forwardInvocation:]",
"#20 CoreFoundation 0X0000000185CB3EC0 ()",
"#21 CoreFoundation 0X0000000185BB696C _CF_forwarding_prep_0()",
"#22 CoreFoundation 0X0000000185CB6050 ()",
"#23 CoreFoundation 0X0000000185BB1F9C -[NSInvocation invoke]",
"#24 WebCore 0X0000000194AADA60 ()",
"#25 CoreFoundation 0X0000000185C67F8C ()",
"#26 CoreFoundation 0X0000000185C67230 ()",
"#27 CoreFoundation 0X0000000185C652E0 ()",
"#28 CoreFoundation 0X0000000185B90F74 CFRunLoopRunSpecific()",
"#29 GraphicsServices 0X000000018F5F36FC GSEventRunModal()",
"#30 UIKit 0X000000018A792D94 UIApplicationMain()",
"#31 CareAwareConnect 0X000000010013CA1C -[LocationsRetriever .cxx_destruct]",
"#32 libdyld.dylib 0X0000000197FCEA08 ()"
]

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

Product Version: iPhone OS Version 8.4.1 (Build 12H321)
Created: 2015-10-23T15:35:47.883330
Originated: 2015-10-23T10:30:00
Open Radar Link: http://www.openradar.me/23235185