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==== Analysis ====
==== Analysis ====
* [https://bugs.chromium.org/p/project-zero/issues/detail?id=1685 Bug report by Lokihardt (Oct 3, 2018)]
* [https://bugs.chromium.org/p/project-zero/issues/detail?id=1685 bug report by Lokihardt (Oct 3, 2018)]
* [https://github.com/WebKit/webkit/commit/51a62eb53815863a1bd2dd946d12f383e8695db0 WebKit fix commit (Oct 15, 2018)]
* [https://github.com/WebKit/webkit/commit/51a62eb53815863a1bd2dd946d12f383e8695db0 Fix commit (Oct 15, 2018)]
* [https://mastodon.social/@buherator/101654714198519755 Announce of incoming write-up by rkmylo and buherator/stratan/@5tratan, Meligra Team (Feb 25, 2019)]
* [https://mastodon.social/@buherator/101654714198519755 Announce of incoming write-up by rkmylo and buherator/stratan/@5tratan, Meligra Team (Feb 25, 2019)]
* [https://rstforums.com/forum/topic/110439-cve-2018-4441-oob-rw-via-jsarrayunshiftcountwitharraystorage-webkit/ Write-up mirrored by Nytro (Feb 27, 2019)]
* [https://rstforums.com/forum/topic/110439-cve-2018-4441-oob-rw-via-jsarrayunshiftcountwitharraystorage-webkit/ Write-up mirrored by Nytro (Feb 27, 2019)]


==== Bug Description ====
==== Bug Description ====
We would take the fast path for JSArray::shiftCountWithArrayStorage when the array hasHoles(). However, the code for this was wrong. It would incorrectly update ArrayStorage::m_numValuesInVector.


==== Exploit Implementation ====
==== Exploit Implementation ====
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