diff --git a/crypto/sm2/sm2_oct.c b/crypto/sm2/sm2_oct.c
old mode 100644
new mode 100755
index 6f951e77..f9ca4cfb
--- a/crypto/sm2/sm2_oct.c
+++ b/crypto/sm2/sm2_oct.c
@@ -274,7 +274,9 @@ SM2CiphertextValue *o2i_SM2CiphertextValue(const EC_GROUP *group,
 	ret = cv;
 
 end:
-	SM2CiphertextValue_free(cv);
+	if ((cv != *pout) && (!ret))
+		SM2CiphertextValue_free(cv);
+
 	EC_POINT_free(point);
 	BN_CTX_free(bn_ctx);
 	return ret;