xref: /third_party/libxml2/backport-malloc-fail-Fix-null-deref-after-xmlXIncludeNewRef.patch

From c40cbf07a30c264846ad1135a3670535942441f6 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Mon, 8 May 2023 17:03:00 +0200
Subject: [PATCH] malloc-fail: Fix null deref after xmlXIncludeNewRef

See #344.

Reference:https://github.com/GNOME/libxml2/commit/c40cbf07a30c264846ad1135a3670535942441f6
Conflict:xinclude.c

---
 xinclude.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/xinclude.c b/xinclude.c
index c0b4439..a9da439 100644
--- a/xinclude.c
+++ b/xinclude.c
@@ -246,19 +246,9 @@ xmlXIncludeNewRef(xmlXIncludeCtxtPtr ctxt, const xmlChar *URI,
     ret->count = 0;
     ret->xml = 0;
     ret->inc = NULL;
-    if (ctxt->incMax == 0) {
-	ctxt->incMax = 4;
-        ctxt->incTab = (xmlXIncludeRefPtr *) xmlMalloc(ctxt->incMax *
-					      sizeof(ctxt->incTab[0]));
-        if (ctxt->incTab == NULL) {
-	    xmlXIncludeErrMemory(ctxt, ref, "growing XInclude context");
-	    xmlXIncludeFreeRef(ret);
-	    return(NULL);
-	}
-    }
     if (ctxt->incNr >= ctxt->incMax) {
         xmlXIncludeRefPtr *tmp;
-        size_t newSize = ctxt->incMax * 2;
+        size_t newSize = ctxt->incMax ? ctxt->incMax * 2 : 4;
 
         tmp = (xmlXIncludeRefPtr *) xmlRealloc(ctxt->incTab,
 	             newSize * sizeof(ctxt->incTab[0]));
@@ -268,7 +258,7 @@ xmlXIncludeNewRef(xmlXIncludeCtxtPtr ctxt, const xmlChar *URI,
 	    return(NULL);
 	}
         ctxt->incTab = tmp;
-        ctxt->incMax *= 2;
+        ctxt->incMax = newSize;
     }
     ctxt->incTab[ctxt->incNr++] = ret;
     return(ret);
-- 
2.27.0