WebKit: out-of-bounds read in WebCore::SimpleLineLayout::RunResolver::runForPoint(CVE-2017-13784)

There is an out-of-bounds read security vulnerability in WebKit. The vulnerability was confirmed on ASan build of WebKit nightly. ASan log: ================================================================= ==30436==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x606000560c48 at pc...