Bug 286831

Summary:

An infinite loop happens when drawing wavy underline for small text at a very large x-position

Product:

WebKit

Reporter:

Said Abou-Hallawa <sabouhallawa>

Component:

Layout and Rendering

Assignee:

Said Abou-Hallawa <sabouhallawa>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

bfulgham, simon.fraser, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

WebKit Nightly Build

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
test case (Will jetsam)	none

Said Abou-Hallawa

Reported 2025-01-31 15:16:28 PST

Created attachment 474082 [details] test case (Will jetsam) Open the attached text case. Result: WebKit enters an infinite loop and eventually it jetsams. This happens because of floating point precision. If a float which is greater than 2^23 is added to a fraction which is less than 0.5, the result will be equal to the large number and the fraction will be dropped. float x = 10000000; float step = 0.2; float y = x + step; // y will be equal to x;

Attachments
test case (Will jetsam) (284 bytes, text/html) 2025-01-31 15:16 PST, Said Abou-Hallawa	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Said Abou-Hallawa

Comment 1 2025-01-31 15:17:20 PST

rdar://141022987

Said Abou-Hallawa

Comment 2 2025-01-31 15:29:31 PST

Pull request: https://github.com/WebKit/WebKit/pull/39837

EWS

Comment 3 2025-01-31 21:59:50 PST

Committed 289659@main (8cf800b33c66): <https://commits.webkit.org/289659@main> Reviewed commits have been landed. Closing PR #39837 and removing active labels.

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