[Webkit-unassigned] [Bug 158794] New: OOM Assertion failure in JSON.stringify

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158794

            Bug ID: 158794
           Summary: OOM Assertion failure in JSON.stringify
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andre.bargull at gmail.com

SVN: rev202088
Build with: perl Tools/Scripts/build-jsc --gtk --debug


The following test case triggers this assertion error:
---
ASSERTION FAILED: m_buffer->length() >= m_length
---


Test case:
---
var s = "a".repeat(0x7ffffff)
var p = new Array(50).fill(s);
var r = JSON.stringify(p)
---


Stack trace:
---
#0  0x00007ffff6de7098 in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:317
#1  0x00007ffff6e21883 in WTF::StringBuilder::appendUninitializedSlow<unsigned char> (this=0x7fffffffc790, requiredLength=4160749631)
    at ../../Source/WTF/wtf/text/StringBuilder.cpp:227
#2  0x00007ffff6e214d6 in WTF::StringBuilder::appendUninitialized<unsigned char> (this=0x7fffffffc790, length=1) at ../../Source/WTF/wtf/text/StringBuilder.cpp:215
#3  0x00007ffff6e1fc39 in WTF::StringBuilder::append (this=0x7fffffffc790, characters=0x7fffffffc4e4 ",\177", length=1)
    at ../../Source/WTF/wtf/text/StringBuilder.cpp:283
#4  0x00007ffff5f80add in WTF::StringBuilder::append (this=0x7fffffffc790, c=44 ',') at ../../Source/WTF/wtf/text/StringBuilder.h:144
#5  0x00007ffff5f80b0c in WTF::StringBuilder::append (this=0x7fffffffc790, c=44 ',') at ../../Source/WTF/wtf/text/StringBuilder.h:149
#6  0x00007ffff6c074c9 in JSC::Stringifier::Holder::appendNextProperty (this=0x7fffffffc8e8, stringifier=..., builder=...)
    at ../../Source/JavaScriptCore/runtime/JSONObject.cpp:493
#7  0x00007ffff6c06e53 in JSC::Stringifier::appendStringifiedValue (this=0x7fffffffc860, builder=..., value=..., holder=0x7fffaf1dbf40, propertyName=...)
    at ../../Source/JavaScriptCore/runtime/JSONObject.cpp:384
#8  0x00007ffff6c064c5 in JSC::Stringifier::stringify (this=0x7fffffffc860, value=...) at ../../Source/JavaScriptCore/runtime/JSONObject.cpp:259
#9  0x00007ffff6c08ee5 in JSC::JSONProtoFuncStringify (exec=0x7fffffffcb20) at ../../Source/JavaScriptCore/runtime/JSONObject.cpp:782
...
---

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