Check size before allocation to avoid out-of-memory errors.

tests/bugfixes/github/test_issue_1522.py

@@ -4,20 +4,16 @@ import system_tests
 class issue_1522_exif_asan(metaclass=system_tests.CaseMeta):
     url      = "https://github.com/Exiv2/exiv2/issues/1522"
     filename = "$data_path/poc_1522.jp2"
-    commands = ["$exiv2     $filename"
+    commands = ["$exiv2 -q  $filename"
                ,"$exiv2 -pS $filename"
                ]
-    retval   = [ 253,1 ] 
-    stderr   = [ """Warning: Failed to decode Exif metadata.
-$filename: No Exif data found in the file
+    retval   = [ 1,1 ]
+    stderr   = [ """$exiv2_exception_message $filename:
+$kerCorruptedMetadata
 ""","""$exiv2_exception_message $filename:
 $kerCorruptedMetadata
 """] 
-    stdout   = ["""File name       : $filename
-File size       : 268 Bytes
-MIME type       : image/jp2
-Image size      : 0 x 0
-""","""STRUCTURE OF JPEG2000 FILE: $filename
+    stdout   = ["","""STRUCTURE OF JPEG2000 FILE: $filename
  address |   length | box       | data
        0 |       12 | jP        | 
       12 |       25 | uuid      | Exif: .