Handle case where decoding returns no image.

fancycode · fancycode · commit da4e4b615424 · 2025-10-30T16:03:49.000+01:00
Triggered by "fuzzing/data/corpus/clusterfuzz-testcase-minimized-file-fuzzer-5752063708495872.heic".
diff --git a/libheif/image-items/image_item.cc b/libheif/image-items/image_item.cc
@@ -708,6 +708,10 @@ Result<std::shared_ptr<HeifPixelImage>> ImageItem::decode_image(const heif_decod
   }
 
   auto img = *decodingResult;
+  if (!img) {
+    // Can happen if missing tiled image is decoded in non-strict mode.
+    return Error(heif_error_Decoder_plugin_error, heif_suberror_Unspecified);
+  }
 
   std::shared_ptr<HeifFile> file = m_heif_context->get_heif_file();
 

Original file line number	Diff line number	Diff line change
`@@ -708,6 +708,10 @@ Result<std::shared_ptr<HeifPixelImage>> ImageItem::decode_image(const heif_decod`
`708`	`708`	`}`
`709`	`709`
`710`	`710`	`auto img = *decodingResult;`
	`711`	`+ if (!img) {`
	`712`	`+ // Can happen if missing tiled image is decoded in non-strict mode.`
	`713`	`+ return Error(heif_error_Decoder_plugin_error, heif_suberror_Unspecified);`
	`714`	`+ }`
`711`	`715`
`712`	`716`	`std::shared_ptr<HeifFile> file = m_heif_context->get_heif_file();`
`713`	`717`