diff --git a/src/mln_rs.c b/src/mln_rs.c
index 1a8d8d4..18a26f0 100644
--- a/src/mln_rs.c
+++ b/src/mln_rs.c
@@ -289,7 +289,7 @@ MLN_FUNC(static, mln_rs_matrix_t *, mln_rs_matrix_co_inverse_matrix, \
     mln_rs_matrix_t *matrix, *inverse;
     mln_u8ptr_t p, *pend, data;
 
-    if ((data = (mln_u8ptr_t)malloc((n + k) * len)) == NULL) {
+    if ((data = (mln_u8ptr_t)malloc((n + k) * n)) == NULL) {
         errno = ENOMEM;
         return NULL;
     }
diff --git a/t/rs.c b/t/rs.c
new file mode 100644
index 0000000..55e90bb
--- /dev/null
+++ b/t/rs.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <assert.h>
+#include "mln_rs.h"
+
+#define COL  10
+#define ROW  10
+#define K    2
+
+int main(int argc, char *argv[])
+{
+    int i, j;
+    mln_rs_result_t *res, *dres;
+    uint8_t origin[COL * ROW] = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789";
+    uint8_t *err[ROW + K] = {0};
+
+    assert((res = mln_rs_encode(origin, COL, ROW, K)) != NULL);
+
+    printf("res->num=%ld, res->len=%ld\n", res->num, res->len);
+
+    for (i = 0; i < mln_rs_result_get_num(res); ++i) {
+        err[i] = mln_rs_result_get_data_by_index(res, i);
+    }
+    err[0] = NULL;
+    err[1] = NULL;
+
+    assert((dres = mln_rs_decode(err,COL, ROW, K)) != NULL);
+
+    for (i = 0; i < mln_rs_result_get_num(dres); ++i) {
+        for (j = 0; j < COL; ++j) {
+            printf("%c", mln_rs_result_get_data_by_index(dres, i)[j]);
+        }
+        printf("\n");
+    }
+
+    mln_rs_result_free(res);
+    mln_rs_result_free(dres);
+    return 0;
+}