xref: /third_party/libxml2/backport-parser-Fix-push-parser-with-1-3-byte-initial-chunk.patch

From e2d37972e41224b11ff76f3a9fd689207b6108a6 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 20 Nov 2022 15:35:49 +0100
Subject: [PATCH 21/28] parser: Fix push parser with 1-3 byte initial chunk

Make sure that ctxt->charset is initialized properly.

Reference: https://github.com/GNOME/libxml2/commit/55fb8f72ac726b4f760136070e0d2093ffcdb3ac
Conflict: NA
---
 parser.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/parser.c b/parser.c
index 7553f86..4615db0 100644
--- a/parser.c
+++ b/parser.c
@@ -12523,9 +12523,10 @@ xmlCreatePushParserCtxt(xmlSAXHandlerPtr sax, void *user_data,
      * the encoding, we set the context to XML_CHAR_ENCODING_NONE so
      * that it can be automatically determined later
      */
-    if ((size == 0) || (chunk == NULL)) {
-	ctxt->charset = XML_CHAR_ENCODING_NONE;
-    } else if ((ctxt->input != NULL) && (ctxt->input->buf != NULL)) {
+    ctxt->charset = XML_CHAR_ENCODING_NONE;
+
+    if ((size != 0) && (chunk != NULL) &&
+        (ctxt->input != NULL) && (ctxt->input->buf != NULL)) {
 	size_t base = xmlBufGetInputBase(ctxt->input->buf->buffer, ctxt->input);
 	size_t cur = ctxt->input->cur - ctxt->input->base;
 
-- 
2.27.0