setSampleBufferAsDisplayImmediately should check that attachment arra…

…y is not null

https://bugs.webkit.org/show_bug.cgi?id=262556
rdar://115712997

Reviewed by Brent Fulgham.

CMSampleBufferGetSampleAttachmentsArray may return a null attachment array even if createIfNecessary = true, in case of error.
In that case, make sure setSampleBufferAsDisplayImmediately bails out early.

* Source/WebCore/platform/graphics/avfoundation/objc/LocalSampleBufferDisplayLayer.mm:
(WebCore::setSampleBufferAsDisplayImmediately):

Canonical link: https://commits.webkit.org/268802@main

Source/WebCore/platform/graphics/avfoundation/objc/LocalSampleBufferDisplayLayer.mm

@@ -357,6 +357,8 @@ static void runWithoutAnimations(const WTF::Function<void()>& function)
 static void setSampleBufferAsDisplayImmediately(CMSampleBufferRef sampleBuffer)
 {
     CFArrayRef attachmentsArray = PAL::CMSampleBufferGetSampleAttachmentsArray(sampleBuffer, true);
+    if (!attachmentsArray)
+        return;
     for (CFIndex i = 0; i < CFArrayGetCount(attachmentsArray); ++i) {
         CFMutableDictionaryRef attachments = checked_cf_cast<CFMutableDictionaryRef>(CFArrayGetValueAtIndex(attachmentsArray, i));
         CFDictionarySetValue(attachments, PAL::kCMSampleAttachmentKey_DisplayImmediately, kCFBooleanTrue);