File _service:tar_scm:backport-parser-Fix-potential-... of Package libxml2

File _service:tar_scm:backport-parser-Fix-potential-memory-leak-in-xmlParseAttValue.patch of Package libxml2 (Revision 0797abd6db1e4d289775c7bf87a00cd7)

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From 1a2d8ddc066143d256fdb8cc554707fe141dd2f6 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 11 Oct 2022 13:02:47 +0200
Subject: [PATCH] parser: Fix potential memory leak in xmlParseAttValueInternal

Fix memory leak in case xmlParseAttValueInternal is called with a NULL
`len` a non-NULL `alloc` argument. This static function is never called
with such arguments internally, but the misleading code should be fixed
nevertheless.

Fixes #422.

Reference:https://github.com/GNOME/libxml2/commit/1a2d8ddc066143d256fdb8cc554707fe141dd2f6
Conflict:NA

---
 parser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/parser.c b/parser.c
index 7bb47366..337e62f6 100644
--- a/parser.c
+++ b/parser.c
@@ -9155,6 +9155,7 @@ xmlParseAttValueInternal(xmlParserCtxtPtr ctxt, int *len, int *alloc,
     in++;
     col++;
     if (len != NULL) {
+        if (alloc) *alloc = 0;
         *len = last - start;
         ret = (xmlChar *) start;
     } else {
@@ -9164,7 +9165,6 @@ xmlParseAttValueInternal(xmlParserCtxtPtr ctxt, int *len, int *alloc,
     CUR_PTR = in;
     ctxt->input->line = line;
     ctxt->input->col = col;
-    if (alloc) *alloc = 0;
     return ret;
 need_complex:
     if (alloc) *alloc = 1;
-- 
2.27.0