From 2ccac1e42f34404e3a5af22671a31fa1dca94e94 Mon Sep 17 00:00:00 2001
From: Peter Krempa <pkrempa@redhat.com>
Date: Tue, 30 Jan 2024 17:11:37 +0100
Subject: [PATCH] virNodeDeviceCapVPDFormat: Properly escape system-originated
 strings
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Similarly to previous commit other specific fields which come from the
system data and aren't sanitized enough to be safe for XML were also
formatted via virBufferAsprintf.

Other static and safe strings used virBufferEscapeString instead of
virBufferAddLit.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/conf/node_device_conf.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index 87c046e571d..95de77abe9d 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -270,14 +270,6 @@ virNodeDeviceCapVPDFormatCustomSystemField(virPCIVPDResourceCustom *field, virBu
     virNodeDeviceCapVPDFormatCustomField(buf, "system_field", field);
 }
 
-static inline void
-virNodeDeviceCapVPDFormatRegularField(virBuffer *buf, const char *keyword, const char *value)
-{
-    if (keyword == NULL || value == NULL)
-        return;
-
-    virBufferAsprintf(buf, "<%s>%s</%s>\n", keyword, value, keyword);
-}
 
 static void
 virNodeDeviceCapVPDFormat(virBuffer *buf, virPCIVPDResource *res)
@@ -290,31 +282,33 @@ virNodeDeviceCapVPDFormat(virBuffer *buf, virPCIVPDResource *res)
     virBufferEscapeString(buf, "<name>%s</name>\n", res->name);
 
     if (res->ro != NULL) {
-        virBufferEscapeString(buf, "<fields access='%s'>\n", "readonly");
-
+        virBufferAddLit(buf, "<fields access='readonly'>\n");
         virBufferAdjustIndent(buf, 2);
-        virNodeDeviceCapVPDFormatRegularField(buf, "change_level", res->ro->change_level);
-        virNodeDeviceCapVPDFormatRegularField(buf, "manufacture_id", res->ro->manufacture_id);
-        virNodeDeviceCapVPDFormatRegularField(buf, "part_number", res->ro->part_number);
-        virNodeDeviceCapVPDFormatRegularField(buf, "serial_number", res->ro->serial_number);
+
+        virBufferEscapeString(buf, "<change_level>%s</change_level>\n", res->ro->change_level);
+        virBufferEscapeString(buf, "<manufacture_id>%s</manufacture_id>\n", res->ro->manufacture_id);
+        virBufferEscapeString(buf, "<part_number>%s</part_number>\n", res->ro->part_number);
+        virBufferEscapeString(buf, "<serial_number>%s</serial_number>\n", res->ro->serial_number);
+
         g_ptr_array_foreach(res->ro->vendor_specific,
                             (GFunc)virNodeDeviceCapVPDFormatCustomVendorField, buf);
-        virBufferAdjustIndent(buf, -2);
 
+        virBufferAdjustIndent(buf, -2);
         virBufferAddLit(buf, "</fields>\n");
     }
 
     if (res->rw != NULL) {
-        virBufferEscapeString(buf, "<fields access='%s'>\n", "readwrite");
-
+        virBufferAddLit(buf, "<fields access='readwrite'>\n");
         virBufferAdjustIndent(buf, 2);
-        virNodeDeviceCapVPDFormatRegularField(buf, "asset_tag", res->rw->asset_tag);
+
+        virBufferEscapeString(buf, "<asset_tag>%s</asset_tag>\n", res->rw->asset_tag);
+
         g_ptr_array_foreach(res->rw->vendor_specific,
                             (GFunc)virNodeDeviceCapVPDFormatCustomVendorField, buf);
         g_ptr_array_foreach(res->rw->system_specific,
                             (GFunc)virNodeDeviceCapVPDFormatCustomSystemField, buf);
-        virBufferAdjustIndent(buf, -2);
 
+        virBufferAdjustIndent(buf, -2);
         virBufferAddLit(buf, "</fields>\n");
     }