blockdev: fix drive_init() opts and bs_opts leaks

These memory leaks also make drive_add if=none,id=drive0 without a file=
option leak the options list.  This keeps ID "drive0" around forever.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

blockdev.c

@@ -341,7 +341,7 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
     qemu_opts_absorb_qdict(opts, bs_opts, &error);
     if (error_is_set(&error)) {
         error_propagate(errp, error);
-        return NULL;
+        goto early_err;
     }
 
     if (id) {
@@ -361,7 +361,7 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
     if ((buf = qemu_opt_get(opts, "discard")) != NULL) {
         if (bdrv_parse_discard_flags(buf, &bdrv_flags) != 0) {
             error_setg(errp, "invalid discard option");
-            return NULL;
+            goto early_err;
         }
     }
 
@@ -383,7 +383,7 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
             /* this is the default */
         } else {
            error_setg(errp, "invalid aio option");
-           return NULL;
+           goto early_err;
         }
     }
 #endif
@@ -393,13 +393,13 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
             error_printf("Supported formats:");
             bdrv_iterate_format(bdrv_format_print, NULL);
             error_printf("\n");
-            return NULL;
+            goto early_err;
         }
 
         drv = bdrv_find_format(buf);
         if (!drv) {
             error_setg(errp, "'%s' invalid format", buf);
-            return NULL;
+            goto early_err;
         }
     }
 
@@ -435,20 +435,20 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
 
     if (!check_throttle_config(&cfg, &error)) {
         error_propagate(errp, error);
-        return NULL;
+        goto early_err;
     }
 
     on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
     if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
         if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO && type != IF_NONE) {
             error_setg(errp, "werror is not supported by this bus type");
-            return NULL;
+            goto early_err;
         }
 
         on_write_error = parse_block_error_action(buf, 0, &error);
         if (error_is_set(&error)) {
             error_propagate(errp, error);
-            return NULL;
+            goto early_err;
         }
     }
 
@@ -456,13 +456,13 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
     if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
         if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI && type != IF_NONE) {
             error_report("rerror is not supported by this bus type");
-            return NULL;
+            goto early_err;
         }
 
         on_read_error = parse_block_error_action(buf, 1, &error);
         if (error_is_set(&error)) {
             error_propagate(errp, error);
-            return NULL;
+            goto early_err;
         }
     }
 
@@ -491,6 +491,8 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
         if (has_driver_specific_opts) {
             file = NULL;
         } else {
+            QDECREF(bs_opts);
+            qemu_opts_del(opts);
             return dinfo;
         }
     }
@@ -529,12 +531,13 @@ static DriveInfo *blockdev_init(QDict *bs_opts,
     return dinfo;
 
 err:
-    qemu_opts_del(opts);
-    QDECREF(bs_opts);
     bdrv_unref(dinfo->bdrv);
     g_free(dinfo->id);
     QTAILQ_REMOVE(&drives, dinfo, next);
     g_free(dinfo);
+early_err:
+    QDECREF(bs_opts);
+    qemu_opts_del(opts);
     return NULL;
 }