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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - IntlObject uses JSArray::tryCreateUninitialized in an unsafe way"
href="https://bugs.webkit.org/show_bug.cgi?id=167288">167288</a>
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<th>Summary</th>
<td>IntlObject uses JSArray::tryCreateUninitialized in an unsafe way
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>msaboff@apple.com
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<pre>IntlObject.cpp uses JSArray::tryCreateUninitialized() in three locations in a unsafe way. If the caller of tryCreateUninitialized allocates object when initializing the array contents, it needs to have an active GCDeferralContext. This is responsible for a GC related crash in LayoutTests/js/intl.html, see attached crash dump.
It really isn’t appropriate for IntlObject to be using tryCreateUninitialized() as it is intended for performance sensitive Array allocation sites. The appropriate fix is to provide a JSArray::tryCreate() method for code like IntlObject to use.
<rdar://problem/30134434></pre>
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