CVPixelBufferGetBytePointerCallback should check for CVPixelBufferGet…

…BaseAddress returning nullptr

https://bugs.webkit.org/show_bug.cgi?id=241845
rdar://95622853

Patch by Youenn Fablet <youennf@gmail.com> on 2022-06-22
Reviewed by Eric Carlson.

CVPixelBufferGetBaseAddress may return nullptr in some cases.
In that case, return early.

* Source/WebCore/platform/graphics/cv/PixelBufferConformerCV.cpp:
(WebCore::CVPixelBufferGetBytePointerCallback):

Canonical link: https://commits.webkit.org/251739@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295734 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/platform/graphics/cv/PixelBufferConformerCV.cpp

@@ -70,6 +70,12 @@ static const void* CVPixelBufferGetBytePointerCallback(void* refcon)
 
     ++info->lockCount;
     void* address = CVPixelBufferGetBaseAddress(info->pixelBuffer.get());
+    if (!address) {
+        RELEASE_LOG_ERROR(Media, "CVPixelBufferGetBaseAddress returned null");
+        RELEASE_LOG_STACKTRACE(Media);
+        return nullptr;
+    }
+
     size_t byteLength = CVPixelBufferGetBytesPerRow(info->pixelBuffer.get()) * CVPixelBufferGetHeight(info->pixelBuffer.get());
 
     verifyImageBufferIsBigEnough(address, byteLength);