diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 171b2713d2e5..25f257e41a96 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -109,9 +109,11 @@ static inline void spin_unlock_bucket(unsigned int hash)
 static void gfs2_qd_dealloc(struct rcu_head *rcu)
 {
 	struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
-	struct gfs2_sbd *sdp = qd->qd_sbd;
+	struct gfs2_sbd *sdp = READ_ONCE(qd->qd_sbd);
 
 	kmem_cache_free(gfs2_quotad_cachep, qd);
+	if (!sdp)
+		return;
 	if (atomic_dec_and_test(&sdp->sd_quota_count))
 		wake_up(&sdp->sd_kill_wait);
 }