[webkit-changes] [WebKit/WebKit] a68ad5: Protect WebProcess::unblockServicesRequiredByAcces...

[Brent Fulgham]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: a68ad5db5c8327163866f7f1ece33604d2ac5c7d
      https://github.com/WebKit/WebKit/commit/a68ad5db5c8327163866f7f1ece33604d2ac5c7d
  Author: Brent Fulgham <bfulgham at apple.com>
  Date:   2024-01-29 (Mon, 29 Jan 2024)

  Changed paths:
    M Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm

  Log Message:
  -----------
  Protect WebProcess::unblockServicesRequiredByAccessibility from attempting to consume nullptr sandbox extensions
https://bugs.webkit.org/show_bug.cgi?id=268314
<rdar://121746329>

Reviewed by Per Arne Vollan.

The code in WebProcess::unblockServicesRequiredByAccessibility assumes that it
will always work with non-nullptr Sandbox Extensions. However, it's possible
for the SandboxExtension::create() method to return nullptr, so we should harden
this code to avoid crashing under such conditions.

* Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm:
(WebKit::WebProcess::unblockServicesRequiredByAccessibility):

Canonical link: https://commits.webkit.org/273719@main