fix: stricter date parsing in value.cpp (#1720)

* Regression test for issue 1713

* Stricter date parsing.

* Fix test failure caused by stdout mismatch.

(cherry picked from commit ab58026)

src/value.cpp

@@ -913,7 +913,10 @@ namespace Exiv2 {
         std::memcpy(b, reinterpret_cast<const char*>(buf), 8);
         int scanned = sscanf(b, "%4d%2d%2d",
                              &date_.year, &date_.month, &date_.day);
-        if (scanned != 3) {
+        if (   scanned != 3
+            || date_.year < 0
+            || date_.month < 1 || date_.month > 12
+            || date_.day < 1 || date_.day > 31) {
 #ifndef SUPPRESS_WARNINGS
             EXV_WARNING << Error(kerUnsupportedDateFormat) << "\n";
 #endif
@@ -931,9 +934,12 @@ namespace Exiv2 {
 #endif
             return 1;
         }
-        int scanned = sscanf(buf.c_str(), "%4d-%d-%d",
+        int scanned = sscanf(buf.c_str(), "%4d-%2d-%2d",
                              &date_.year, &date_.month, &date_.day);
-        if (scanned != 3) {
+        if (   scanned != 3
+            || date_.year < 0
+            || date_.month < 1 || date_.month > 12
+            || date_.day < 1 || date_.day > 31) {
 #ifndef SUPPRESS_WARNINGS
             EXV_WARNING << Error(kerUnsupportedDateFormat) << "\n";
 #endif
@@ -954,7 +960,7 @@ namespace Exiv2 {
         // sprintf wants to add the null terminator, so use oversized buffer
         char temp[9];
 
-        int wrote = sprintf(temp, "%04d%02d%02d", date_.year, date_.month, date_.day);
+        int wrote = snprintf(temp, sizeof(temp), "%04d%02d%02d", date_.year, date_.month, date_.day);
         assert(wrote == 8);
         std::memcpy(buf, temp, wrote);
         return wrote;

test/data/issue_1713_poc.xmp

@@ -0,0 +1,87 @@
+<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
+<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="3.1.2-113">
+ <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <rdf:Description rdf:about=""
+    xmlns:dc="http://purl.org/dc/elements/1.1/"
+    xmlns:xmp="http://ns.adobe.com/xap/1.0/"
+    xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
+    xmlns:stRef="http://ns.adobe.com/xap/1.0/sType/ResourceRef#"
+    xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
+    xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
+    xmlns:exif="http://ns.adobe.com/exif/1.0/"
+   dc:format="image/jpeg"
+   xmp:CreatorTool="Adobe Photoshop CS2 Macintosh"
+   xmp:CreateDate="2005-09-07415:07:40-07:00"
+   xmp:ModifyDate="2005-09-07T15:09:51-07:00"
+   xmp:MetadataDate="2006-04-10T13:37:10-07:00"
+   xmpMM:DocumentID="uuid:9A3B7F52214211DAB6308A7391270C13"
+   xmpMM:InstanceID="uuid:B59AC1B3214311DAB6308A7391270C13"
+   photoshop:ColorMode="3"
+   photoshop:ICCProfile="sRGB IEC61966-2.1"
+   tiff:Orientation="1"
+   tiff:XResolution="720000/10000"
+   tiff:YResŽlution="720000/10000"
+   tiff:ResolutionUnit="2"
+   tiff:ImageWidth="360"
+   tiff:ImageLength="216"
+   tiff:NativeDigest="256,257,258,259,262,274,277,284,530,531,282,28256FC8D17D036C26919E106D"
+   tiff:Make="Nikon"
+   exif:PixelelYDimension="216"
+   exif:ColorSpace="1"
+   exif:NativeDigest="36864,40960,40961,37121,37122,40962,40963,37510,;0964,36867,36868,33434,33437,34850,34852,34855,34856,32,23,24,25,26,27,28,30;76DBD9F0A5E7ED8F62B4CE8EFA6478B4">
+   <dc:title>
+    <rdf:Alt>
+     <rdf:li xml:lang="en-US">Blue Square Test File - .jpg</rdf:li>
+     <rdf:li xml:lang="x-default">Blue Square Test File - .jpg</rdf:li>
+     <rdf:li xml:lang="de-CH">Blaues Quadrat Test Datei - .jpg</rdf:li>
+    </rdf:Alt>
+   </dc:title>
+   <dc:description>
+    <rdf:Alt>
+     <rdf:li xml:lang="x-default">XMPFiles BlueSquare test file, created in Photoshop CS2, saved as .psd, .jpg, and .tif.</rdf:li>
+    </rdf:Alt>
+   </dc:description>
+   <dc:subject>
+    <rdf:Bag>
+     <rdf:li>XMP</rdf:li>
+     <rdf:li>Blue Square</rdf:li>
+     <rdf:li>test file</rdf:li>
+     <rdf:li>Photoshop</rdf:li>
+     <rdf:li>.jpg</rdf:li>
+    </rdf:Bag>
+   </dc:subject>
+   <xmpMM:DerivedFrom
+    stRef:instanceID="uuid:9A3B7F4F214211DAB6308A7391270C13"
+    stRef:documentID="uuid:9A3B7F4E214211DAB6308A7391270C13"/>
+   <tiff:BitsPerSample>
+    <rdf:Seq>
+     <rdf:li>8</rdf:li>
+     <rdf:li>8</rdf:li>
+     <rdf:li>8</rdf:li>
+    </rdf:Seq>
+   </tiff:BitsPerSample>
+  </rdf:Description>
+ </rdf:RDF>
+</x:xmpmeta>
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<?xpacket end="w"?>

tests/bugfixes/github/test_issue_1713.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+
+from system_tests import CaseMeta, path
+
+
+class InvalidDateXMP(metaclass=CaseMeta):
+    """
+    Regression test for the bug described in:
+    https://github.com/Exiv2/exiv2/issues/1713
+    """
+    url = "https://github.com/Exiv2/exiv2/issues/1713"
+
+    filename = path("$data_path/issue_1713_poc.xmp")
+    commands = ["$exiv2 -Ph $filename"]
+
+    stderr = [
+"""Warning: Failed to convert Xmp.xmp.CreateDate to Exif.Photo.DateTimeDigitized (Day is out of range)
+Exiv2 exception in print action for file $filename:
+Xmpdatum::copy: Not supported
+"""
+]
+    retval = [1]
+
+    def compare_stdout(self, i, command, got_stdout, expected_stdout):
+        """ We don't care about the stdout, just don't crash """
+        pass