Bug 13495 – REPRODUCIBLE CRASH: Referencing an undefined entity in an XHTML document

• Component: XML
• Status: RESOLVED FIXED

[Matt Perry]

If an xhtml document contains a reference to an undefined entity, the browser will crash in XMLTokenizer.cpp getEntityHandler:
        ent = getXHTMLEntity(name);
        ent->etype = XML_INTERNAL_GENERAL_ENTITY; // CRASH: ent is NULL

See attached test case.

[Matt Perry]

Created attachment 14192 [details]
testcase for crash

[David Kilzer (:ddkilzer)]

Confirmed with a local debug build of WebKit r21103 with Safari 2.0.4 (419.3) on Mac OS X 10.4.9 (8P135).

Stack:

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000030

Thread 0 Crashed:
0   com.apple.WebCore        	0x0103bd88 WebCore::getEntityHandler(void*, unsigned char const*) + 220 (XMLTokenizer.cpp:1089)
1   libxml2.2.dylib          	0x91d68784 xmlParseEntityRef + 208
2   libxml2.2.dylib          	0x91d68020 xmlParseReference + 324
3   libxml2.2.dylib          	0x91d6d704 xmlParseDocument + 4416
4   libxml2.2.dylib          	0x91d51c0c xmlParseChunk + 424
5   com.apple.WebCore        	0x010383ac WebCore::XMLTokenizer::write(WebCore::SegmentedString const&, bool) + 416 (XMLTokenizer.cpp:569)
6   com.apple.WebCore        	0x0149364c WebCore::FrameLoader::write(char const*, int, bool) + 1212 (FrameLoader.cpp:929)
7   com.apple.WebCore        	0x014937b8 WebCore::FrameLoader::addData(char const*, int) + 320 (FrameLoader.cpp:1608)
8   com.apple.WebCore        	0x0111b0a4 -[WebCoreFrameBridge addData:] + 232 (WebCoreFrameBridge.mm:291)
9   com.apple.WebCore        	0x0111fd54 -[WebCoreFrameBridge receivedData:textEncodingName:] + 316 (WebCoreFrameBridge.mm:1477)
10  com.apple.WebKit         	0x0034396c -[WebHTMLRepresentation receivedData:withDataSource:] + 296 (WebHTMLRepresentation.mm:175)
11  com.apple.WebKit         	0x0033cc34 -[WebDataSource(WebInternal) _receivedData:] + 116 (WebDataSource.mm:178)
12  com.apple.WebKit         	0x003c6ab8 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) + 184
13  com.apple.WebCore        	0x0148f204 WebCore::FrameLoader::committedLoad(WebCore::DocumentLoader*, char const*, int) + 92 (FrameLoader.cpp:3021)
14  com.apple.WebCore        	0x014a4290 WebCore::DocumentLoader::commitLoad(char const*, int) + 104 (DocumentLoader.cpp:347)
15  com.apple.WebCore        	0x014a4318 WebCore::DocumentLoader::receivedData(char const*, int) + 104 (DocumentLoader.cpp:360)
16  com.apple.WebCore        	0x0148df54 WebCore::FrameLoader::receivedData(char const*, int) + 60 (FrameLoader.cpp:2044)
17  com.apple.WebCore        	0x014a62ec WebCore::MainResourceLoader::addData(char const*, int, bool) + 92 (MainResourceLoader.cpp:134)
18  com.apple.WebCore        	0x014a8e08 WebCore::ResourceLoader::didReceiveData(char const*, int, long long, bool) + 104
19  com.apple.WebCore        	0x014a6698 WebCore::MainResourceLoader::didReceiveData(char const*, int, long long, bool) + 288 (MainResourceLoader.cpp:289)
20  com.apple.WebCore        	0x014a877c WebCore::ResourceLoader::didReceiveData(WebCore::ResourceHandle*, char const*, int, int) + 108
21  com.apple.WebCore        	0x0147dbbc -[WebCoreResourceHandleAsDelegate connection:didReceiveData:lengthReceived:] + 240 (ResourceHandleMac.mm:352)
22  com.apple.Foundation     	0x92c15624 -[NSURLConnection(NSURLConnectionInternal) _sendDidReceiveDataCallback] + 564
23  com.apple.Foundation     	0x92c13ac4 -[NSURLConnection(NSURLConnectionInternal) _sendCallbacks] + 488
24  com.apple.Foundation     	0x92c13860 _sendCallbacks + 156
25  com.apple.CoreFoundation 	0x907df4fc __CFRunLoopDoSources0 + 384
26  com.apple.CoreFoundation 	0x907dea2c __CFRunLoopRun + 452
27  com.apple.CoreFoundation 	0x907de4ac CFRunLoopRunSpecific + 268
28  com.apple.HIToolbox      	0x9329bb20 RunCurrentEventLoopInMode + 264
29  com.apple.HIToolbox      	0x9329b1b4 ReceiveNextEventCommon + 380
30  com.apple.HIToolbox      	0x9329b020 BlockUntilNextEventMatchingListInMode + 96
31  com.apple.AppKit         	0x937a1ae4 _DPSNextEvent + 384
32  com.apple.AppKit         	0x937a17a8 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 116
33  com.apple.Safari         	0x00006740 0x1000 + 22336
34  com.apple.AppKit         	0x9379dcec -[NSApplication run] + 472
35  com.apple.AppKit         	0x9388e87c NSApplicationMain + 452
36  com.apple.Safari         	0x0005c77c 0x1000 + 374652
37  com.apple.Safari         	0x0005c624 0x1000 + 374308

[Matt Perry]

Created attachment 14206 [details]
patch with layout test

[Alexey Proskuryakov]

Comment on attachment 14206 [details]
patch with layout test

r=me

Two comments:
- the test should go to fast/parser, as dom/ is for imported W3C tests;
- I'd prefer the test to be a text one, and not to display the error.

Going to fix these when landing the patch.

[Alexey Proskuryakov]

Committed revision 21118.