change from review

Author: devnexen

ext/fileinfo/fileinfo.c

@@ -283,6 +283,7 @@ static const char* php_fileinfo_from_path(struct magic_set *magic, const zend_st
 	ZEND_ASSERT(path);
 	ZEND_ASSERT(ZSTR_LEN(path) != 0);
 	ZEND_ASSERT(!zend_str_has_nul_byte(path));
+	ZEND_ASSERT(context != NULL);
 
 	/* determine if the file is a local file or remote URL */
 	const char *dummy;
@@ -343,6 +344,9 @@ PHP_FUNCTION(finfo_file)
 		RETURN_THROWS();
 	}
 	php_stream_context *context = php_stream_context_from_zval(zcontext, false);
+	if (!context) {
+		RETURN_THROWS();
+	}
 
 	/* Set options for the current file/buffer. */
 	if (options) {

ext/fileinfo/tests/gh18267.phpt

@@ -5,7 +5,7 @@ fileinfo
 --FILE--
 <?php
 $cls = new finfo();
-$f = fopen("test", "r");
+$f = fopen("test", "w+");
 try {
     $cls->file("test",FILEINFO_NONE, $f);
 } catch (\TypeError $e) {