From 21f37037fac7d90cf529bf4fbc3137b60b028142 Mon Sep 17 00:00:00 2001
From: Daniel Dennedy <ddennedy@gopro.com>
Date: Mon, 7 Dec 2020 14:29:10 -0800
Subject: [PATCH] fix heif load fails with 0 length metadata

fixes #1901
---
 libvips/foreign/heifload.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libvips/foreign/heifload.c b/libvips/foreign/heifload.c
index 0e99b337..aba2efab 100644
--- a/libvips/foreign/heifload.c
+++ b/libvips/foreign/heifload.c
@@ -467,6 +467,8 @@ vips_foreign_load_heif_set_header( VipsForeignLoadHeif *heif, VipsImage *out )
 		printf( "metadata type = %s, length = %zu\n", type, length ); 
 #endif /*DEBUG*/
 
+		if( !length )
+			continue;
 		if( !(data = VIPS_ARRAY( out, length, unsigned char )) )
 			return( -1 );
 		error = heif_image_handle_get_metadata(