[PATCH 13/13] virshFindDisk: Sanitize use of 'tmp' variable

[Peter Krempa <pkrempa@xxxxxxxxxx>]

The return value of virXMLPropString was assigned into 'tmp' multiple
times and to prevent static analyzers moaning about a potential leak a
short-circuited if+logic or was used.

Replace the code by having a helper variable for each possibility and
also replace the for-loop to iterate elements.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 tools/virsh-domain.c | 48 +++++++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
index 8bd058a33a..4d8690d9db 100644
--- a/tools/virsh-domain.c
+++ b/tools/virsh-domain.c
@@ -12642,7 +12642,6 @@ virshFindDisk(const char *doc,
     g_autoptr(xmlXPathContext) ctxt = NULL;
     g_autofree xmlNodePtr *nodes = NULL;
     ssize_t nnodes;
-    xmlNodePtr cur = NULL;
     size_t i;

     xml = virXMLParseStringCtxt(doc, _("(domain_definition)"), &ctxt);
@@ -12658,6 +12657,13 @@ virshFindDisk(const char *doc,

     /* search disk using @path */
     for (i = 0; i < nnodes; i++) {
+        xmlNodePtr sourceNode;
+        g_autofree char *sourceFile = NULL;
+        g_autofree char *sourceDev = NULL;
+        g_autofree char *sourceDir = NULL;
+        g_autofree char *sourceName = NULL;
+        g_autofree char *targetDev = NULL;
+
         if (type == VIRSH_FIND_DISK_CHANGEABLE) {
             g_autofree char *device = virXMLPropString(nodes[i], "device");

@@ -12668,29 +12674,25 @@ virshFindDisk(const char *doc,
                 continue;
         }

-        cur = nodes[i]->children;
-        while (cur != NULL) {
-            if (cur->type == XML_ELEMENT_NODE) {
-                g_autofree char *tmp = NULL;
-
-                if (virXMLNodeNameEqual(cur, "source")) {
-                    if ((tmp = virXMLPropString(cur, "file")) ||
-                        (tmp = virXMLPropString(cur, "dev")) ||
-                        (tmp = virXMLPropString(cur, "dir")) ||
-                        (tmp = virXMLPropString(cur, "name"))) {
-                    }
-                } else if (virXMLNodeNameEqual(cur, "target")) {
-                    tmp = virXMLPropString(cur, "dev");
-                }
+        if ((sourceNode = virXMLNodeGetSubelement(nodes[i], "source"))) {
+            sourceFile = virXMLPropString(sourceNode, "file");
+            sourceDev = virXMLPropString(sourceNode, "dev");
+            sourceDir = virXMLPropString(sourceNode, "dir");
+            sourceName = virXMLPropString(sourceNode, "name");
+        }

-                if (STREQ_NULLABLE(tmp, path)) {
-                    xmlNodePtr ret = xmlCopyNode(nodes[i], 1);
-                    /* drop backing store since they are not needed here */
-                    virshDiskDropBackingStore(ret);
-                    return ret;
-                }
-            }
-            cur = cur->next;
+        ctxt->node = nodes[i];
+        targetDev = virXPathString("string(./target/@dev)", ctxt);
+
+        if (STREQ_NULLABLE(targetDev, path) ||
+            STREQ_NULLABLE(sourceFile, path) ||
+            STREQ_NULLABLE(sourceDev, path) ||
+            STREQ_NULLABLE(sourceDir, path) ||
+            STREQ_NULLABLE(sourceName, path)) {
+            xmlNodePtr ret = xmlCopyNode(nodes[i], 1);
+            /* drop backing store since they are not needed here */
+            virshDiskDropBackingStore(ret);
+            return ret;
         }
     }

-- 
2.38.1