From 1aabc9db40dc5ec1f8f22c09e74c63dda53f7ed6 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 22 Jan 2023 13:20:15 +0100
Subject: [PATCH] malloc-fail: Fix null deref in xmlBufResize

Found with libFuzzer, see #344.

Reference:https://github.com/GNOME/libxml2/commit/1aabc9db40dc5ec1f8f22c09e74c63dda53f7ed6
Conflict:NA
---
 buf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/buf.c b/buf.c
index e851364..69370b7 100644
--- a/buf.c
+++ b/buf.c
@@ -821,7 +821,8 @@ xmlBufResize(xmlBufPtr buf, size_t size)
 	if (buf->content == NULL) {
 	    rebuf = (xmlChar *) xmlMallocAtomic(newSize);
 	    buf->use = 0;
-	    rebuf[buf->use] = 0;
+            if (rebuf != NULL)
+	        rebuf[buf->use] = 0;
 	} else if (buf->size - buf->use < 100) {
 	    rebuf = (xmlChar *) xmlRealloc(buf->content, newSize);
         } else {
-- 
2.27.0

