Fix memory leak when initDocDict() fails

Related: RHEL-120801

fix-initDocDict-memory-leak.patch

@@ -0,0 +1,45 @@
+From 495b40c534e63cc49d64e8369cb726b3ec88d7c3 Mon Sep 17 00:00:00 2001
+From: Charalampos Stratakis <cstratak@redhat.com>
+Date: Fri, 20 Feb 2026 16:58:28 +0100
+Subject: [PATCH] Free xmlDoc on initDocDict failure in _newXMLDoc/_newHTMLDoc
+
+If __GLOBAL_PARSER_CONTEXT.initDocDict() raises an exception after
+xmlNewDoc()/htmlNewDoc() has already allocated the document, the
+error path never frees it.
+---
+ src/lxml/parser.pxi | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+diff --git a/src/lxml/parser.pxi b/src/lxml/parser.pxi
+index 8d53277..43e6476 100644
+--- a/src/lxml/parser.pxi
++++ b/src/lxml/parser.pxi
+@@ -1972,7 +1972,11 @@ cdef xmlDoc* _newXMLDoc() except NULL:
+         raise MemoryError()
+     if result.encoding is NULL:
+         result.encoding = tree.xmlStrdup(<unsigned char*>"UTF-8")
+-    __GLOBAL_PARSER_CONTEXT.initDocDict(result)
++    try:
++        __GLOBAL_PARSER_CONTEXT.initDocDict(result)
++    except:
++        tree.xmlFreeDoc(result)
++        raise
+     return result
+ 
+ cdef xmlDoc* _newHTMLDoc() except NULL:
+@@ -1980,7 +1984,11 @@ cdef xmlDoc* _newHTMLDoc() except NULL:
+     result = tree.htmlNewDoc(NULL, NULL)
+     if result is NULL:
+         raise MemoryError()
+-    __GLOBAL_PARSER_CONTEXT.initDocDict(result)
++    try:
++        __GLOBAL_PARSER_CONTEXT.initDocDict(result)
++    except:
++        tree.xmlFreeDoc(result)
++        raise
+     return result
+ 
+ cdef xmlDoc* _copyDoc(xmlDoc* c_doc, int recursive) except NULL:
+-- 
+2.53.0
+

python3.14-lxml.spec

@@ -24,6 +24,12 @@ Source1:        get-lxml-source.sh
 # https://github.com/lxml/lxml/commit/39cdf11f5d2cf6e4f810202b6e415afd350d3df2
 Patch:          fix-memory-leaks.patch
 
+# Free xmlDoc when initDocDict() fails in _newXMLDoc/_newHTMLDoc.
+# Downstream only
+# Fixed upstream in 0b512418 by removing these initDocDict() calls entirely
+# but this is backwards incompatible.
+Patch:          fix-initDocDict-memory-leak.patch
+
 BuildRequires:  gcc
 BuildRequires:  libxml2-devel
 BuildRequires:  libxslt-devel