Bug 252335

Summary: AX: Scrolling a PDF with VoiceOver enabled causes a crash
Product: WebKit Reporter: Tyler Wilcock <tyler_w>
Component: AccessibilityAssignee: Tyler Wilcock <tyler_w>
Status: RESOLVED FIXED    
Severity: Normal CC: aboxhall, andresg_22, apinheiro, cfleizach, dmazzoni, ews-watchlist, jcraig, jdiggs, samuel_white, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Other   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
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Description Tyler Wilcock 2023-02-15 12:23:48 PST
Scrolling a PDF with VoiceOver enabled causes a crash.
Comment 1 Radar WebKit Bug Importer 2023-02-15 12:24:00 PST
<rdar://problem/105509452>
Comment 2 Tyler Wilcock 2023-02-15 12:40:49 PST
Created attachment 465009 [details]
Patch
Comment 3 Tyler Wilcock 2023-02-15 12:41:20 PST
rdar://105470972
Comment 4 chris fleizach 2023-02-15 12:47:33 PST
Comment on attachment 465009 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=465009&action=review

> Source/WebKit/WebProcess/Plugins/PDF/PDFPlugin.mm:451
> +    callOnMainRunLoopAndWait([&] {

do we need to wait for this?
Comment 5 Tyler Wilcock 2023-02-15 13:10:01 PST
(In reply to chris fleizach from comment #4)
> Comment on attachment 465009 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=465009&action=review
> 
> > Source/WebKit/WebProcess/Plugins/PDF/PDFPlugin.mm:451
> > +    callOnMainRunLoopAndWait([&] {
> 
> do we need to wait for this?
Perhaps not, but this function is called from non-accessibility codepaths too, and I thought it might be safer to preserve the synchronous behavior in case some caller depends on that.
Comment 6 Tyler Wilcock 2023-02-15 13:22:10 PST
Created attachment 465011 [details]
Patch
Comment 7 Tyler Wilcock 2023-02-15 13:25:45 PST
Actually I believe these other non-accessibility codepaths will be going through the main runloop, meaning `callOnMainRunLoop` (without the andWait) would be sync. Uploaded a new patch using callOnMainRunLoop, please re-review when you get a moment.
Comment 8 Tyler Wilcock 2023-02-15 13:28:41 PST
Created attachment 465012 [details]
Patch
Comment 9 EWS 2023-02-17 10:12:57 PST
Committed 260451@main (83013c6d19eb): <https://commits.webkit.org/260451@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 465012 [details].