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Commitf24605e

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Fix memory leak in XMLSERIALIZE(... INDENT).
xmltotext_with_options sometimes tries to replace the existingroot node of a libxml2 document. In that case xmlDocSetRootElementwill unlink and return the old root node; if we fail to free it,it's leaked for the remainder of the session. The amount of memoryat stake is not large, a couple hundred bytes per occurrence, butthat could still become annoying in heavy usage.Our only other xmlDocSetRootElement call is not at risk becauseit's working on a just-created document, but let's modify thatcode too to make it clear that it's dependent on that.Author: Tom Lane <tgl@sss.pgh.pa.us>Reviewed-by: Jim Jones <jim.jones@uni-muenster.de>Discussion:https://postgr.es/m/1358967.1747858817@sss.pgh.pa.usBackpatch-through: 16
1 parent5d6eac8 commitf24605e

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1 file changed

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  • src/backend/utils/adt

1 file changed

+17
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‎src/backend/utils/adt/xml.c

Lines changed: 17 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -754,15 +754,22 @@ xmltotext_with_options(xmltype *data, XmlOptionType xmloption_arg, bool indent)
754754
* content nodes, and then iterate over the nodes.
755755
*/
756756
xmlNodePtrroot;
757+
xmlNodePtroldroot;
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xmlNodePtrnewline;
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759760
root=xmlNewNode(NULL, (constxmlChar*)"content-root");
760761
if (root==NULL||xmlerrcxt->err_occurred)
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xml_ereport(xmlerrcxt,ERROR,ERRCODE_OUT_OF_MEMORY,
762763
"could not allocate xml node");
763764

764-
/* This attaches root to doc, so we need not free it separately. */
765-
xmlDocSetRootElement(doc,root);
765+
/*
766+
* This attaches root to doc, so we need not free it separately...
767+
* but instead, we have to free the old root if there was one.
768+
*/
769+
oldroot=xmlDocSetRootElement(doc,root);
770+
if (oldroot!=NULL)
771+
xmlFreeNode(oldroot);
772+
766773
xmlAddChildList(root,content_nodes);
767774

768775
/*
@@ -1850,6 +1857,7 @@ xml_parse(text *data, XmlOptionType xmloption_arg,
18501857
else
18511858
{
18521859
xmlNodePtrroot;
1860+
xmlNodePtroldrootPG_USED_FOR_ASSERTS_ONLY;
18531861

18541862
/* set up document with empty root node to be the context node */
18551863
doc=xmlNewDoc(version);
@@ -1868,8 +1876,13 @@ xml_parse(text *data, XmlOptionType xmloption_arg,
18681876
if (root==NULL||xmlerrcxt->err_occurred)
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xml_ereport(xmlerrcxt,ERROR,ERRCODE_OUT_OF_MEMORY,
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"could not allocate xml node");
1871-
/* This attaches root to doc, so we need not free it separately. */
1872-
xmlDocSetRootElement(doc,root);
1879+
1880+
/*
1881+
* This attaches root to doc, so we need not free it separately;
1882+
* and there can't yet be any old root to free.
1883+
*/
1884+
oldroot=xmlDocSetRootElement(doc,root);
1885+
Assert(oldroot==NULL);
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18741887
/* allow empty content */
18751888
if (*(utf8string+count))

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