106308 2013-01-08 00:03:21 -0800 [Chromium] WebGL typed array constructor crashes on exception 2013-01-11 10:40:39 -0800 1 1 1 Unclassified WebKit WebGL 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mstarzinger kbr abarth dglazkov eric haraken japhet kbr webkit.review.bot oldest_to_newest 802095 0 mstarzinger 2013-01-08 00:03:21 -0800 An object whose 'length' property is an accessor that throws an exception might crash the WebGL typed array constructor when passed as a single parameter. The underlying cause is a missing check for an empty handle after the 'length' property is read. This only applies to the V8 bindings. I have attached a simplified test case that reproduces the problem. Note that I strongly suspect that the same problem exists when one of the elements is defined as a throwing accessor, but I didn't write a repro for this yet. 802097 1 181661 mstarzinger 2013-01-08 00:04:14 -0800 Created attachment 181661 Test case to reproduce bug. 804874 2 182243 kbr 2013-01-10 19:03:45 -0800 Created attachment 182243 Patch 805006 3 182243 haraken 2013-01-10 23:46:58 -0800 Comment on attachment 182243 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=182243&action=review > Source/WebCore/bindings/v8/custom/V8ArrayBufferViewCustom.h:176 > + v8::Local<v8::Value> val = srcArray->Get(v8::String::NewSymbol("length")); > + if (val.IsEmpty()) { > + // Exception thrown during fetch of length property. Another way to detect an exception is: v8::TryCatch block; v8::Local<v8::Value> val = srcArray->Get(v8::String::NewSymbol("length")); if (block->hadException()) return v8Null(); But as far as I see other code, it looks like we are likely to check IsEmpty() rather than using v8::TryCatch. So your code looks fine. > Source/WebCore/bindings/v8/custom/V8ArrayBufferViewCustom.h:177 > + return v8::Null(); Nit: v8::Null() => v8Null() Are you sure that this should be not v8Undefined() but v8Null()? 805347 4 182243 kbr 2013-01-11 10:03:56 -0800 Comment on attachment 182243 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=182243&action=review >> Source/WebCore/bindings/v8/custom/V8ArrayBufferViewCustom.h:176 >> + // Exception thrown during fetch of length property. > > Another way to detect an exception is: > > v8::TryCatch block; > v8::Local<v8::Value> val = srcArray->Get(v8::String::NewSymbol("length")); > if (block->hadException()) > return v8Null(); > > But as far as I see other code, it looks like we are likely to check IsEmpty() rather than using v8::TryCatch. So your code looks fine. Yes, I saw the TryCatch class in the V8 API but it seemed more direct to check for the failure case. >> Source/WebCore/bindings/v8/custom/V8ArrayBufferViewCustom.h:177 >> + return v8::Null(); > > Nit: v8::Null() => v8Null() > > Are you sure that this should be not v8Undefined() but v8Null()? Looking at other similar code it should be v8Undefined. The return value is ignored however since the exception is thrown to the calling code. I'll upload a new patch. 805349 5 182359 kbr 2013-01-11 10:06:17 -0800 Created attachment 182359 Patch 805353 6 182359 haraken 2013-01-11 10:09:50 -0800 Comment on attachment 182359 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=182359&action=review > Source/WebCore/bindings/v8/custom/V8ArrayBufferViewCustom.h:179 > + len = toUInt32(val); This conversion can fail too. So you might want to do: bool ok; len = toUInt32(val, ok); if (!ok) { ...; } Either way let's fix it in a follow-up patch. 805394 7 182359 webkit.review.bot 2013-01-11 10:40:35 -0800 Comment on attachment 182359 Patch Clearing flags on attachment: 182359 Committed r139459: <http://trac.webkit.org/changeset/139459> 805395 8 webkit.review.bot 2013-01-11 10:40:39 -0800 All reviewed patches have been landed. Closing bug. 181661 2013-01-08 00:04:14 -0800 2013-01-08 00:04:14 -0800 Test case to reproduce bug. issue-chromium-168545.html text/html 134 mstarzinger PHNjcmlwdD4KCnZhciBvID0ge307Ck9iamVjdC5kZWZpbmVQcm9wZXJ0eShvLCAibGVuZ3RoIiwg eyBnZXQ6IGZ1bmN0aW9uKCkgeyB0aHJvdyAiYmFpbCI7IH19KTsKdmFyIGEgPSBuZXcgSW50MTZB cnJheShvKTsKCjwvc2NyaXB0Pgo= 182243 2013-01-10 19:03:45 -0800 2013-01-11 10:06:14 -0800 Patch bug-106308-20130110190048.patch text/plain 10930 kbr U3VidmVyc2lvbiBSZXZpc2lvbjogMTM5MTIxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZGJiM2NjYzI4Y2E0Nzg1 OWI5NDA0MjhjYjgyNmFlZWMwZjAxMWE1NC4uMWMyYjNjNTlmZjVkYzM0NmI0M2UwYzFkMzk0ZDcw NDIxZTQ3Yzc5YiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIwIEBACisyMDEzLTAxLTEwICBLZW5u ZXRoIFJ1c3NlbGwgIDxrYnJAZ29vZ2xlLmNvbT4KKworICAgICAgICBbQ2hyb21pdW1dIFdlYkdM IHR5cGVkIGFycmF5IGNvbnN0cnVjdG9yIGNyYXNoZXMgb24gZXhjZXB0aW9uCisgICAgICAgIGh0 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