32111 2009-12-03 03:10:31 -0800 Geolocation bug causes crash when watch is cleared from some callbacks 2009-12-04 03:30:54 -0800 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 steveblock steveblock commit-queue steveblock webkit.review.bot oldest_to_newest 168339 0 steveblock 2009-12-03 03:10:31 -0800 In Geolocation::GeoNotifier::timerFired, a JS callback may be invoked if a fatal error was registered on this GeoNotifier or if this request has timed out. If the request is a watch, and is cleared by a call to clearWatch in the callback, the GeoNotifier object will be destroyed. This then causes a crash when the m_geolocation member is accessed to call Geolocation::fatalErrorOccurred or Geolocation::requestTimedOut. Note that use of the GeoNotifier this pointer as a parameter for the Geolocation methods is safe, even if the GeoNotifier object has been destroyed, as the this pointer is used only as a look-up in a map. 168396 1 44241 steveblock 2009-12-03 07:11:28 -0800 Created attachment 44241 Patch 1 for Bug 32111 168399 2 webkit.review.bot 2009-12-03 07:15:14 -0800 style-queue ran check-webkit-style on attachment 44241 without any errors. 168595 3 44241 darin 2009-12-03 16:58:19 -0800 Comment on attachment 44241 Patch 1 for Bug 32111 > + // Cache our pointer to the Geolocation object, as this GeoNotifier object > + // could be deleted by a call to clearWatch in a callback. > + Geolocation* geolocation = m_geolocation; Since the Geolocation object is reference counted, shouldn't this be a RefPtr? If not, then why is the Geolocation object reference counted? In other words, what guarantees it will not be destroyed? 168705 4 steveblock 2009-12-04 03:18:31 -0800 > Since the Geolocation object is reference counted, shouldn't this be a RefPtr? > If not, then why is the Geolocation object reference counted? In other words, > what guarantees it will not be destroyed? The GeoNotifier objects are owned by the Geolocation object and their lifetime is controlled with RefPtrs. Each GeoNotifier has a raw pointer back to the Geolocation object which it uses to make callbacks. Since the GeoNotifier objects are owned by the Geolocation object, the Geolocation object is guaranteed to have a longer lifespan, so the raw Geolocation pointers held by the GeoNotifier objects will always be valid. 168710 5 44241 commit-queue 2009-12-04 03:30:49 -0800 Comment on attachment 44241 Patch 1 for Bug 32111 Clearing flags on attachment: 44241 Committed r51692: <http://trac.webkit.org/changeset/51692> 168711 6 commit-queue 2009-12-04 03:30:54 -0800 All reviewed patches have been landed. Closing bug. 44241 2009-12-03 07:11:28 -0800 2009-12-04 03:30:49 -0800 Patch 1 for Bug 32111 clearWatchCrash.txt text/plain 11331 steveblock SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA1MTYzNikKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMjMgQEAKKzIwMDktMTItMDMgIFN0ZXZlIEJsb2NrICA8c3RldmVibG9ja0Bnb29n bGUuY29tPgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAg IEZpeGVzIGEgY3Jhc2hpbmcgYnVnIGluIEdlb2xvY2F0aW9uIHdoZW4gYSB3YXRjaCBpcyBjbGVh cmVkIGZyb20gc29tZSBjYWxsYmFja3MuIAorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9y Zy9zaG93X2J1Zy5jZ2k/aWQ9MzIxMTEKKworICAgICAgICBJbiBHZW9sb2NhdGlvbjo6R2VvTm90 aWZpZXI6OnRpbWVyRmlyZWQsIGEgSlMgY2FsbGJhY2sgbWF5IGJlIGludm9rZWQgaWYgYQorICAg ICAgICBmYXRhbCBlcnJvciB3YXMgcmVnaXN0ZXJlZCBvbiB0aGlzIEdlb05vdGlmaWVyIG9yIGlm IHRoaXMgcmVxdWVzdCBoYXMgdGltZWQKKyAgICAgICAgb3V0LiBJZiB0aGUgcmVxdWVzdCBpcyBh 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