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Commitc168ba3

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Free libxml2/libxslt resources in a safer order.
Mark Simonetti reported that libxslt sometimes crashes for him, and thatswapping xslt_process's object-freeing calls around to do them in reverseorder of creation seemed to fix it. I've not reproduced the crash, butvalgrind clearly shows a reference to already-freed memory, which isconsistent with the idea that shutdown of the xsltTransformContext istrying to reference the already-freed stylesheet or input document.With this patch, valgrind is no longer unhappy.I have an inquiry in to see if this is a libxslt bug or if we're justabusing the library; but even if it's a library bug, we'd want to adjustour code so it doesn't fail with unpatched libraries.Back-patch to all supported branches, because we've been doing this inthe wrong(?) order for a long time.
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‎contrib/xml2/xslt_proc.c

Lines changed: 9 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -146,16 +146,16 @@ xslt_process(PG_FUNCTION_ARGS)
146146
}
147147
PG_CATCH();
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{
149-
if (stylesheet!=NULL)
150-
xsltFreeStylesheet(stylesheet);
151149
if (restree!=NULL)
152150
xmlFreeDoc(restree);
153-
if (doctree!=NULL)
154-
xmlFreeDoc(doctree);
155-
if (xslt_sec_prefs!=NULL)
156-
xsltFreeSecurityPrefs(xslt_sec_prefs);
157151
if (xslt_ctxt!=NULL)
158152
xsltFreeTransformContext(xslt_ctxt);
153+
if (xslt_sec_prefs!=NULL)
154+
xsltFreeSecurityPrefs(xslt_sec_prefs);
155+
if (stylesheet!=NULL)
156+
xsltFreeStylesheet(stylesheet);
157+
if (doctree!=NULL)
158+
xmlFreeDoc(doctree);
159159
xsltCleanupGlobals();
160160

161161
pg_xml_done(xmlerrcxt, true);
@@ -164,11 +164,11 @@ xslt_process(PG_FUNCTION_ARGS)
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}
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PG_END_TRY();
166166

167-
xsltFreeStylesheet(stylesheet);
168167
xmlFreeDoc(restree);
169-
xmlFreeDoc(doctree);
170-
xsltFreeSecurityPrefs(xslt_sec_prefs);
171168
xsltFreeTransformContext(xslt_ctxt);
169+
xsltFreeSecurityPrefs(xslt_sec_prefs);
170+
xsltFreeStylesheet(stylesheet);
171+
xmlFreeDoc(doctree);
172172
xsltCleanupGlobals();
173173

174174
pg_xml_done(xmlerrcxt, false);

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