diff --git a/chain.c b/chain.c
index 6ecd6ed..ba5ae5f 100644
--- a/chain.c
+++ b/chain.c
@@ -63,7 +63,10 @@ int mm_chain_dp(int max_dist, int bw, int max_skip, int min_sc, int n, mm128_t *
 	for (i = n_u = 0; i < n; ++i)
 		if (t[i] == 0 && f[i] >= min_sc)
 			++n_u;
-	if (n_u == 0) return 0;
+	if (n_u == 0) {
+		kfree(km, f); kfree(km, p); kfree(km, t);
+		return 0;
+	}
 	u = (uint64_t*)kmalloc(km, n_u * 8);
 	for (i = n_u = 0; i < n; ++i)
 		if (t[i] == 0 && f[i] >= min_sc)
@@ -100,7 +103,7 @@ int mm_chain_dp(int max_dist, int bw, int max_skip, int min_sc, int n, mm128_t *
 	kfree(km, f); kfree(km, p); kfree(km, t);
 
 	// write the result to _a_
-	b = kmalloc(km, n_v * sizeof(mm128_t));
+	b = (mm128_t*)kmalloc(km, n_v * sizeof(mm128_t));
 	for (i = 0, k = 0; i < n_u; ++i)
 		for (j = 0; j < (int32_t)u[i]; ++j)
 			b[k] = a[v[k]], ++k;
diff --git a/map.c b/map.c
index e41141b..6d8d761 100644
--- a/map.c
+++ b/map.c
@@ -60,6 +60,8 @@ mm_tbuf_t *mm_tbuf_init(void)
 void mm_tbuf_destroy(mm_tbuf_t *b)
 {
 	if (b == 0) return;
+	kfree(b->km, b->mini.a);
+	sdust_buf_destroy(b->sdb);
 	km_destroy(b->km_fixed);
 	km_destroy(b->km);
 	free(b);
diff --git a/sdust.c b/sdust.c
index 55d7f21..07339dd 100644
--- a/sdust.c
+++ b/sdust.c
@@ -62,6 +62,7 @@ sdust_buf_t *sdust_buf_init(void *km)
 void sdust_buf_destroy(sdust_buf_t *buf)
 {
 	if (buf == 0) return;
+	kdq_destroy(int, buf->w);
 	kfree(buf->km, buf->P.a); kfree(buf->km, buf->res.a); kfree(buf->km, buf);
 }