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Re: [libvirt] [PATCH] Fix a crash when using Open vSwitch virtual ports



On 08/30/2012 01:49 PM, Daniel Veillard wrote:


Daniel, BTW, To test this patch again, it works for me :)

On Wed, Aug 29, 2012 at 02:44:36PM -0400, Kyle Mestery wrote:
Fixup buffer usage when handling VLANs. Also fix the logic
used to determine if the virNetDevVlanPtr is valid or not.
Fixes crashes in the latest code when using Open vSwitch
virtualports.

Signed-off-by: Kyle Mestery<kmestery cisco com>
---
  src/util/virnetdevopenvswitch.c | 26 +++++++++++++-------------
  1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c
index b903ae4..cdbc5ef 100644
--- a/src/util/virnetdevopenvswitch.c
+++ b/src/util/virnetdevopenvswitch.c
@@ -59,7 +59,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
      char *ifaceid_ex_id = NULL;
      char *profile_ex_id = NULL;
      char *vmid_ex_id = NULL;
-    virBufferPtr buf;
+    virBuffer buf = VIR_BUFFER_INITIALIZER;

      virMacAddrFormat(macaddr, macaddrstr);
      virUUIDFormat(ovsport->interfaceID, ifuuidstr);
@@ -79,13 +79,12 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
                          ovsport->profileID)<  0)
              goto out_of_memory;
      }
-    if (virtVlan) {
-        if (VIR_ALLOC(buf)<  0)
-            goto out_of_memory;
+
+    if (virtVlan&&  virtVlan->nTags>  0) {

          /* Trunk port first */
-        if (virtVlan->trunk) {
-            virBufferAddLit(buf, "trunk=");
+        if (virtVlan->trunk == true) {
+            virBufferAddLit(&buf, "trunk=");

              /*
               * Trunk ports have at least one VLAN. Do the first one
@@ -93,21 +92,21 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
               * start of the for loop if there are more than one VLANs
               * on this trunk port.
               */
-            virBufferAsprintf(buf, "%d", virtVlan->tag[i]);
+            virBufferAsprintf(&buf, "%d", virtVlan->tag[i]);

              for (i = 1; i<  virtVlan->nTags; i++) {
-                virBufferAddLit(buf, ",");
-                virBufferAsprintf(buf, "%d", virtVlan->tag[i]);
+                virBufferAddLit(&buf, ",");
+                virBufferAsprintf(&buf, "%d", virtVlan->tag[i]);
              }
          } else if (virtVlan->nTags) {
-            virBufferAsprintf(buf, "tag=%d", virtVlan->tag[0]);
+            virBufferAsprintf(&buf, "tag=%d", virtVlan->tag[0]);
          }
      }

      cmd = virCommandNew(OVSVSCTL);
      if (ovsport->profileID[0] == '\0') {
          virCommandAddArgList(cmd, "--", "--may-exist", "add-port",
-                        brname, ifname, virBufferContentAndReset(buf),
+                        brname, ifname, virBufferCurrentContent(&buf),
                          "--", "set", "Interface", ifname, attachedmac_ex_id,
                          "--", "set", "Interface", ifname, ifaceid_ex_id,
                          "--", "set", "Interface", ifname, vmid_ex_id,
@@ -116,7 +115,7 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,
                          NULL);
      } else {
          virCommandAddArgList(cmd, "--", "--may-exist", "add-port",
-                        brname, ifname, virBufferContentAndReset(buf),
+                        brname, ifname, virBufferCurrentContent(&buf),
                          "--", "set", "Interface", ifname, attachedmac_ex_id,
                          "--", "set", "Interface", ifname, ifaceid_ex_id,
                          "--", "set", "Interface", ifname, vmid_ex_id,
@@ -135,7 +134,8 @@ int virNetDevOpenvswitchAddPort(const char *brname, const char *ifname,

      ret = 0;
  cleanup:
-    VIR_FREE(buf);
+    if (virBufferUse(&buf)>  0)
+        virBufferFreeAndReset(&buf);
   that looks fine up to here, where we could leak in theory,
   virBufferUse() return the amount of bytes used in the buffer, not
   if the buffer was allocated. Sounds to me we can use
   virBufferFreeAndReset() directly without the test

      VIR_FREE(attachedmac_ex_id);
      VIR_FREE(ifaceid_ex_id);
      VIR_FREE(vmid_ex_id);
   I pushed with that small change,

    thanks !

Daniel



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