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Fix CVE-2019-17064
Fix NULL pointer dereference by initializing field before use.
https://forum.xpdfreader.com/viewtopic.php?f=3&t=41890#p42672
diff '--color=auto' -Naurd xpdf-4.02.orig/xpdf/Catalog.cc xpdf-4.02/xpdf/Catalog.cc
--- xpdf-4.02.orig/xpdf/Catalog.cc 2019-09-25 22:54:33.000000000 +0300
+++ xpdf-4.02/xpdf/Catalog.cc 2020-03-01 12:05:43.235486706 +0300
@@ -159,6 +159,7 @@
baseURI = NULL;
form = NULL;
embeddedFiles = NULL;
+ pageLabels = NULL;
#if MULTITHREADED
gInitMutex(&pageMutex);
#endif
@@ -241,7 +242,6 @@
// get the ViewerPreferences object
catDict.dictLookupNF("ViewerPreferences", &viewerPrefs);
- pageLabels = NULL;
if (catDict.dictLookup("PageLabels", &obj)->isDict()) {
readPageLabelTree(&obj);
}
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