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Merge pull request #11577 from Snuffleupagus/Pages-tree-refs

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Prevent circular references in the /Pages tree
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Tim van der Meij 2020-02-27 23:36:11 +01:00 • committed by GitHub
commit e1586016c5
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7 changed files with 155 additions and 8 deletions
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9
src/core/obj.js
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@ -731,6 +731,7 @@ class Catalog {
getPageDict(pageIndex) {
const capability = createPromiseCapability();
const nodesToVisit = [this.catDict.getRaw("Pages")];
const visitedNodes = new RefSet();
const xref = this.xref,
pageKidsCountCache = this.pageKidsCountCache;
let count,
@ -747,6 +748,14 @@ class Catalog {
currentPageIndex += count;
continue;
}
// Prevent circular references in the /Pages tree.
if (visitedNodes.has(currentNode)) {
capability.reject(
new FormatError("Pages tree contains circular reference.")
);
return;
}
visitedNodes.put(currentNode);
xref.fetchAsync(currentNode).then(function(obj) {
if (isDict(obj, "Page") || (isDict(obj) && !obj.has("Kids"))) {