[libvirt] [PATCH 4/7] network: use virAsprintf when appropriate

[Eric Blake]

* src/conf/network_conf.c (virNetworkAllocateBridge): Avoid
limited buffer from snprintf.
---

Why print to a fixed-width buffer to then just strdup it later,
when we can print to a malloc'd buffer in the first place.  Besides,
I couldn't easily guarantee if the buffer was large enough or if
it would contain arbitrary user input.

 src/conf/network_conf.c |   15 ++++++---------
 1 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c
index 347fc0b..4c0248c 100644
--- a/src/conf/network_conf.c
+++ b/src/conf/network_conf.c
@@ -891,17 +891,14 @@ char *virNetworkAllocateBridge(const virNetworkObjListPtr nets,
         template = "virbr%d";

     do {
-        char try[50];
-
-        snprintf(try, sizeof(try), template, id);
-
-        if (!virNetworkBridgeInUse(nets, try, NULL)) {
-            if (!(newname = strdup(try))) {
-                virReportOOMError();
-                return NULL;
-            }
+        if (virAsprintf(&newname, template, id) < 0) {
+            virReportOOMError();
+            return NULL;
+        }
+        if (!virNetworkBridgeInUse(nets, newname, NULL)) {
             return newname;
         }
+        VIR_FREE(newname);

         id++;
     } while (id <= MAX_BRIDGE_ID);
-- 
1.7.2.2