Merge to XFA:Fix heap use after free in CPDFSDK_Annot::GetPDFAnnot.

testing/resources/bug_507316.pdf

Index: testing/resources/bug_507316.pdf
diff --git a/testing/resources/bug_507316.pdf b/testing/resources/bug_507316.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..13c70830f8b51bf50f074d6d518f7fc430c65b68
--- /dev/null
+++ b/testing/resources/bug_507316.pdf
@@ -0,0 +1,145 @@
+%PDF-1.7
+% ò¤ô
+1 0 obj <<
+  /Type /Catalog
+  /Pages 2 0 R
+  /OpenAction 4 0 R
+  /AcroForm 3 0 R
+>>
+endobj
+2 0 obj <<
+  /Type /Pages
+  /Count 3
+  /Kids [6 0 R 7 0 R 8 0 R ]
+>>
+endobj
+3 0 obj <<
+  /CO [11 0 R]
+  /Fields [11 0 R 9 0 R]
+>>
+endobj
+4 0 obj <<
+  /Type /Action
+  /S /JavaScript
+  /JS 5 0 R
+>>
+endobj
+5 0 obj <<>>
+stream
+var i = 0;
+function run()
+{
+  t = this.getField('txtName1');
+  t2 = this.getField('txtName2');
+  t2.setFocus();
+  t.setFocus();
+  t.value='G';
+}
+
+function remove(){
+  if (i==1){
+    this.removeField('txtName2');
+  }
+  i++;
+}
+
+app.setTimeOut('run()',2000);
+endstream
+endobj
+6 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /MediaBox [0 0 612 792]
+  /Resources <<>>
+>>
+endobj
+7 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /MediaBox [0 0 612 792]
+  /Resources <<>>
+>>
+endobj
+8 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /MediaBox [0 0 612 792]
+  /Resources <<>>
+  /Annots [9 0 R 11 0 R]
+>>
+endobj
+9 0 obj <<
+  /FT /Tx
+  /Type /Annot
+  /Subtype /Widget
+  /T (txtName2)
+  /F 4
+  /AP <</N 10 0 R>>
+  /Rect [20 20 400 60]
+>>
+endobj
+10 0 obj <<
+  /Type /XObject
+  /Subtype /Form
+  /FormType 1
+>>
+endobj
+11 0 obj <<
+  /FT /Tx
+  /Type /Annot
+  /Subtype /Widget
+  /T (txtName1)
+  /F 4
+  /AP <</N 12 0 R>>
+  /Rect [200 200 400 260]
+  /AA 13 0 R
+>>
+endobj
+12 0 obj <<
+  /Type /XObject
+  /Subtype /Form
+  /FormType 1
+>>
+endobj
+13 0 obj <<
+  /C 14 0 R
+>>
+endobj
+14 0 obj <<
+  /Type /Action
+  /S /JavaScript
+  /JS 15 0 R
+>>
+endobj
+15 0 obj <<>>
+stream
+this.getField('txtName2').value='B';
+this.pageNum=1;
+remove();
+endstream
+endobj
+xref
+0 16
+0000000000 65535 f 
+0000000015 00000 n 
+0000000106 00000 n 
+0000000182 00000 n 
+0000000243 00000 n 
+0000000309 00000 n 
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+0000000912 00000 n 
+0000001043 00000 n 
+0000001113 00000 n 
+0000001261 00000 n 
+0000001331 00000 n 
+0000001365 00000 n 
+0000001433 00000 n 
+trailer <<
+  /Size 15
+  /Root 1 0 R
+>>
+startxref
+1534
+%%EOF