--- /dev/null
+libxml2-2.9.4: Fix CVE-2016-4658
+
+[No upstream tracking] -- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-4658
+
+xpointer: Disallow namespace nodes in XPointer points and ranges
+
+Namespace nodes must be copied to avoid use-after-free errors.
+But they don't necessarily have a physical representation in a
+document, so simply disallow them in XPointer ranges.
+
+Upstream-Status: Backported
+ - [https://git.gnome.org/browse/libxml2/commit/?id=c1d1f7121194036608bf555f08d3062a36fd344b]
+ - [https://git.gnome.org/browse/libxml2/commit/?id=3f8a91036d338e51c059d54397a42d645f019c65]
+CVE: CVE-2016-4658
+Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
+Signed-off-by: Pascal Bach <pascal.bach@siemens.com>
+
+diff --git a/xpointer.c b/xpointer.c
+index 676c510..911680d 100644
+--- a/xpointer.c
++++ b/xpointer.c
+@@ -320,6 +320,45 @@ xmlXPtrRangesEqual(xmlXPathObjectPtr range1, xmlXPathObjectPtr range2) {
+ }
+
+ /**
++ * xmlXPtrNewRangeInternal:
++ * @start: the starting node
++ * @startindex: the start index
++ * @end: the ending point
++ * @endindex: the ending index
++ *
++ * Internal function to create a new xmlXPathObjectPtr of type range
++ *
++ * Returns the newly created object.
++ */
++static xmlXPathObjectPtr
++xmlXPtrNewRangeInternal(xmlNodePtr start, int startindex,
++ xmlNodePtr end, int endindex) {
++ xmlXPathObjectPtr ret;
++
++ /*
++ * Namespace nodes must be copied (see xmlXPathNodeSetDupNs).
++ * Disallow them for now.
++ */
++ if ((start != NULL) && (start->type == XML_NAMESPACE_DECL))
++ return(NULL);
++ if ((end != NULL) && (end->type == XML_NAMESPACE_DECL))
++ return(NULL);
++
++ ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
++ if (ret == NULL) {
++ xmlXPtrErrMemory("allocating range");
++ return(NULL);
++ }
++ memset(ret, 0, sizeof(xmlXPathObject));
++ ret->type = XPATH_RANGE;
++ ret->user = start;
++ ret->index = startindex;
++ ret->user2 = end;
++ ret->index2 = endindex;
++ return(ret);
++}
++
++/**
+ * xmlXPtrNewRange:
+ * @start: the starting node
+ * @startindex: the start index
+@@ -344,17 +383,7 @@ xmlXPtrNewRange(xmlNodePtr start, int startindex,
+ if (endindex < 0)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start;
+- ret->index = startindex;
+- ret->user2 = end;
+- ret->index2 = endindex;
++ ret = xmlXPtrNewRangeInternal(start, startindex, end, endindex);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -381,17 +410,8 @@ xmlXPtrNewRangePoints(xmlXPathObjectPtr start, xmlXPathObjectPtr end) {
+ if (end->type != XPATH_POINT)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start->user;
+- ret->index = start->index;
+- ret->user2 = end->user;
+- ret->index2 = end->index;
++ ret = xmlXPtrNewRangeInternal(start->user, start->index, end->user,
++ end->index);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -416,17 +436,7 @@ xmlXPtrNewRangePointNode(xmlXPathObjectPtr start, xmlNodePtr end) {
+ if (start->type != XPATH_POINT)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start->user;
+- ret->index = start->index;
+- ret->user2 = end;
+- ret->index2 = -1;
++ ret = xmlXPtrNewRangeInternal(start->user, start->index, end, -1);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -453,17 +463,7 @@ xmlXPtrNewRangeNodePoint(xmlNodePtr start, xmlXPathObjectPtr end) {
+ if (end->type != XPATH_POINT)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start;
+- ret->index = -1;
+- ret->user2 = end->user;
+- ret->index2 = end->index;
++ ret = xmlXPtrNewRangeInternal(start, -1, end->user, end->index);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -486,17 +486,7 @@ xmlXPtrNewRangeNodes(xmlNodePtr start, xmlNodePtr end) {
+ if (end == NULL)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start;
+- ret->index = -1;
+- ret->user2 = end;
+- ret->index2 = -1;
++ ret = xmlXPtrNewRangeInternal(start, -1, end, -1);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -516,17 +506,7 @@ xmlXPtrNewCollapsedRange(xmlNodePtr start) {
+ if (start == NULL)
+ return(NULL);
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start;
+- ret->index = -1;
+- ret->user2 = NULL;
+- ret->index2 = -1;
++ ret = xmlXPtrNewRangeInternal(start, -1, NULL, -1);
+ return(ret);
+ }
+
+@@ -541,6 +521,8 @@ xmlXPtrNewCollapsedRange(xmlNodePtr start) {
+ */
+ xmlXPathObjectPtr
+ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
++ xmlNodePtr endNode;
++ int endIndex;
+ xmlXPathObjectPtr ret;
+
+ if (start == NULL)
+@@ -549,7 +531,12 @@ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
+ return(NULL);
+ switch (end->type) {
+ case XPATH_POINT:
++ endNode = end->user;
++ endIndex = end->index;
++ break;
+ case XPATH_RANGE:
++ endNode = end->user2;
++ endIndex = end->index2;
+ break;
+ case XPATH_NODESET:
+ /*
+@@ -557,39 +544,15 @@ xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
+ */
+ if (end->nodesetval->nodeNr <= 0)
+ return(NULL);
++ endNode = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
++ endIndex = -1;
+ break;
+ default:
+ /* TODO */
+ return(NULL);
+ }
+
+- ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
+- if (ret == NULL) {
+- xmlXPtrErrMemory("allocating range");
+- return(NULL);
+- }
+- memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
+- ret->type = XPATH_RANGE;
+- ret->user = start;
+- ret->index = -1;
+- switch (end->type) {
+- case XPATH_POINT:
+- ret->user2 = end->user;
+- ret->index2 = end->index;
+- break;
+- case XPATH_RANGE:
+- ret->user2 = end->user2;
+- ret->index2 = end->index2;
+- break;
+- case XPATH_NODESET: {
+- ret->user2 = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
+- ret->index2 = -1;
+- break;
+- }
+- default:
+- STRANGE
+- return(NULL);
+- }
++ ret = xmlXPtrNewRangeInternal(start, -1, endNode, endIndex);
+ xmlXPtrRangeCheckOrder(ret);
+ return(ret);
+ }
+@@ -1835,8 +1798,8 @@ xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs) {
+ case XPATH_RANGE: {
+ xmlNodePtr node = tmp->user;
+ if (node != NULL) {
+- if (node->type == XML_ATTRIBUTE_NODE) {
+- /* TODO: Namespace Nodes ??? */
++ if ((node->type == XML_ATTRIBUTE_NODE) ||
++ (node->type == XML_NAMESPACE_DECL)) {
+ xmlXPathFreeObject(obj);
+ xmlXPtrFreeLocationSet(newset);
+ XP_ERROR(XPTR_SYNTAX_ERROR);
+@@ -1931,8 +1894,8 @@ xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs) {
+ case XPATH_RANGE: {
+ xmlNodePtr node = tmp->user2;
+ if (node != NULL) {
+- if (node->type == XML_ATTRIBUTE_NODE) {
+- /* TODO: Namespace Nodes ??? */
++ if ((node->type == XML_ATTRIBUTE_NODE) ||
++ (node->type == XML_NAMESPACE_DECL)) {
+ xmlXPathFreeObject(obj);
+ xmlXPtrFreeLocationSet(newset);
+ XP_ERROR(XPTR_SYNTAX_ERROR);
