drbd: fix memory leak in drbd_adm_resize

new_disk_conf could be leaked if the follow on checks fail,
so make sure to free it on error if it was not assigned yet.

Found with smatch.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index ee34739ee9ffe365efd5b8711b7dde91fb61c00b..613778994b2394bd4c9739bfbf2bb07817ff770c 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2706,6 +2706,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
                mutex_unlock(&device->resource->conf_update);
                synchronize_rcu();
                kfree(old_disk_conf);
+               new_disk_conf = NULL;
        }
 
        ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
@@ -2739,6 +2740,7 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
 
  fail_ldev:
        put_ldev(device);
+       kfree(new_disk_conf);
        goto fail;
 }