libxml2: Check for xmlDocDumpFormatMemory() error case

Since this function needs to allocate memory, it might fail. Check that
the returned memory pointer is not NULL before trying to parse the
output.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

diff --git a/src/utils/xml_libxml2.c b/src/utils/xml_libxml2.c
index c92839461dad4c8fc73ff9ba47b60eecd7808add..7b6d2764b0ed2f0ab24ee65dc6fb1e4a32773cc2 100644 (file)
--- a/src/utils/xml_libxml2.c
+++ b/src/utils/xml_libxml2.c
@@ -212,6 +212,8 @@ char * xml_node_to_str(struct xml_node_ctx *ctx, xml_node_t *node)
        xmlDocSetRootElement(doc, n);
        xmlDocDumpFormatMemory(doc, &buf, &bufsiz, 0);
        xmlFreeDoc(doc);
+       if (!buf)
+               return NULL;
        pos = (char *) buf;
        if (strncmp(pos, "<?xml", 5) == 0) {
                pos = strchr(pos, '>');