commit 554e87a1ea76ce73b4cfe6fca5b9c1bb47502dad
author Albert Astals Cid <aacid@kde.org> Fri Sep 21 18:00:24 2018 +0200
committer Albert Astals Cid <aacid@kde.org> Fri Sep 21 18:00:24 2018 +0200
tree d537bab3fcf21c91c777716df96e9bd23b32f5da
parent 06c344ccb8ccfafa9c506f40226ea2cce0e5f75c

offset from beginning of file can't be < 0

poppler/XRef.cc

diff --git a/poppler/XRef.cc b/poppler/XRef.cc
index 4352146..078274b 100644
--- a/poppler/XRef.cc
+++ b/poppler/XRef.cc
@@ -773,10 +773,10 @@
   }
 
   obj = dict->lookupNF("Prev");
-  if (obj.isInt()) {
+  if (obj.isInt() && obj.getInt() >= 0) {
     *pos = obj.getInt();
     more = gTrue;
-  } else if (obj.isInt64()) {
+  } else if (obj.isInt64() && obj.getInt64() >= 0) {
     *pos = obj.getInt64();
     more = gTrue;
   } else {