Bug 301482 – Null deref in CMUtilities' toCMSampleBuffer

• Component: Media
• Status: RESOLVED FIXED

[Jean-Yves Avenard [:jya]]

Last minute change introduced a null dereference if the sample doesn't contain any attachment.
```
    RetainPtr attachmentsArray = PAL::CMSampleBufferGetSampleAttachmentsArray(rawSampleBuffer, false);
    if (!attachmentsArray || static_cast<size_t>(CFArrayGetCount(attachmentsArray.get())) < samples.size()) {
        RELEASE_LOG_DEBUG(Media, "Encrypted sample doesn't contain sufficient attachments: %u (expected:%u)", static_cast<unsigned>(CFArrayGetCount(attachmentsArray.get()), static_cast<unsigned>(samples.size()));
        return adoptCF(rawSampleBuffer);
    }
```

if `attachmentsArray` is null, CFArrayGetCount will cause a dereference of 0.

[Radar WebKit Bug Importer]

<rdar://problem/163432969>

[Jean-Yves Avenard [:jya]]

Pull request: https://github.com/WebKit/WebKit/pull/53008

[EWS]

Committed 302168@main (f12eb6a08e4b): <https://commits.webkit.org/302168@main>

Reviewed commits have been landed. Closing PR #53008 and removing active labels.