iscsi: do not leak initiator_name

The argument of iscsi_create_context is never freed by libiscsi,
which in fact calls strdup on it.  Avoid a leak.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

block/iscsi.c

@@ -943,7 +943,7 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
         error_report("Failed to parse URL : %s %s", filename,
                      iscsi_get_error(iscsi));
         ret = -EINVAL;
-        goto failed;
+        goto out;
     }
 
     memset(iscsilun, 0, sizeof(IscsiLun));
@@ -954,13 +954,13 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
     if (iscsi == NULL) {
         error_report("iSCSI: Failed to create iSCSI context.");
         ret = -ENOMEM;
-        goto failed;
+        goto out;
     }
 
     if (iscsi_set_targetname(iscsi, iscsi_url->target)) {
         error_report("iSCSI: Failed to set target name.");
         ret = -EINVAL;
-        goto failed;
+        goto out;
     }
 
     if (iscsi_url->user != NULL) {
@@ -969,7 +969,7 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
         if (ret != 0) {
             error_report("Failed to set initiator username and password");
             ret = -EINVAL;
-            goto failed;
+            goto out;
         }
     }
 
@@ -977,13 +977,13 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
     if (parse_chap(iscsi, iscsi_url->target) != 0) {
         error_report("iSCSI: Failed to set CHAP user/password");
         ret = -EINVAL;
-        goto failed;
+        goto out;
     }
 
     if (iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL) != 0) {
         error_report("iSCSI: Failed to set session type to normal.");
         ret = -EINVAL;
-        goto failed;
+        goto out;
     }
 
     iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
@@ -1004,7 +1004,7 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
         != 0) {
         error_report("iSCSI: Failed to start async connect.");
         ret = -EINVAL;
-        goto failed;
+        goto out;
     }
 
     while (!task.complete) {
@@ -1015,11 +1015,7 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
         error_report("iSCSI: Failed to connect to LUN : %s",
                      iscsi_get_error(iscsi));
         ret = -EINVAL;
-        goto failed;
-    }
-
-    if (iscsi_url != NULL) {
-        iscsi_destroy_url(iscsi_url);
+        goto out;
     }
 
     /* Medium changer or tape. We dont have any emulation for this so this must
@@ -1031,19 +1027,22 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
         bs->sg = 1;
     }
 
-    return 0;
+    ret = 0;
 
-failed:
+out:
     if (initiator_name != NULL) {
         g_free(initiator_name);
     }
     if (iscsi_url != NULL) {
         iscsi_destroy_url(iscsi_url);
     }
-    if (iscsi != NULL) {
-        iscsi_destroy_context(iscsi);
+
+    if (ret) {
+        if (iscsi != NULL) {
+            iscsi_destroy_context(iscsi);
+        }
+        memset(iscsilun, 0, sizeof(IscsiLun));
     }
-    memset(iscsilun, 0, sizeof(IscsiLun));
     return ret;
 }