diff --git a/src/tls_trace.c b/src/tls_trace.c
index fde98fb0..b30c2953 100644
--- a/src/tls_trace.c
+++ b/src/tls_trace.c
@@ -533,7 +533,6 @@ int tls_extensions_print(FILE *fp, const uint8_t *exts, size_t extslen, int form
 int tls_hello_request_print(FILE *fp, const uint8_t *data, size_t datalen, int format, int indent)
 {
 	format_print(fp, format, indent, "HelloRequest\n");
-	indent += 4;
 	if (data || datalen > 0) {
 		error_print();
 		return -1;
diff --git a/src/x509_cer.c b/src/x509_cer.c
index a690a4e3..4c350806 100644
--- a/src/x509_cer.c
+++ b/src/x509_cer.c
@@ -1106,7 +1106,7 @@ int x509_cert_sign_to_der(
 	uint8_t **out, size_t *outlen)
 {
 	size_t len = 0;
-	uint8_t *tbs;
+	uint8_t *tbs = NULL;
 	int sig_alg = OID_sm2sign_with_sm3;
 	uint8_t sig[SM2_MAX_SIGNATURE_SIZE];
 	size_t siglen = SM2_signature_typical_size;
diff --git a/src/x509_crl.c b/src/x509_crl.c
index ec6d49ad..f6399bbd 100644
--- a/src/x509_crl.c
+++ b/src/x509_crl.c
@@ -1426,7 +1426,7 @@ int x509_crl_sign_to_der(
 	uint8_t **out, size_t *outlen)
 {
 	size_t len = 0;
-	uint8_t *tbs;
+	uint8_t *tbs = NULL;
 	uint8_t sig[SM2_MAX_SIGNATURE_SIZE];
 	size_t siglen = SM2_signature_typical_size;
 
diff --git a/src/x509_req.c b/src/x509_req.c
index 58df32ed..8a7a7546 100644
--- a/src/x509_req.c
+++ b/src/x509_req.c
@@ -166,7 +166,7 @@ int x509_req_sign_to_der(
 	uint8_t **out, size_t *outlen)
 {
 	size_t len = 0;
-	uint8_t *tbs;
+	uint8_t *tbs = NULL;
 	int sig_alg = OID_sm2sign_with_sm3;
 	uint8_t sig[SM2_MAX_SIGNATURE_SIZE];
 	size_t siglen = SM2_signature_typical_size;
diff --git a/src/zuc.c b/src/zuc.c
index 7640a64e..cb2188e0 100644
--- a/src/zuc.c
+++ b/src/zuc.c
@@ -298,7 +298,6 @@ void zuc_encrypt(ZUC_STATE *state, const uint8_t *in, size_t inlen, uint8_t *out
 
 		// table lookup together makes 10% faster
 		T0 = S0[(U >> 24)       ];
-		T0 = S0[(U >> 24)       ];
 		T2 = S0[(U >>  8) & 0xFF];
 		T4 = S0[(V >> 24)       ];
 		T6 = S0[(V >>  8) & 0xFF];
@@ -435,12 +434,12 @@ void zuc_mac_update(ZUC_MAC_CTX *ctx, const uint8_t *data, size_t len)
 
 void zuc_mac_finish(ZUC_MAC_CTX *ctx, const uint8_t *data, size_t nbits, uint8_t mac[4])
 {
-	ZUC_UINT32 T = ctx->T;
-	ZUC_UINT32 K0 = ctx->K0;
+	ZUC_UINT32 T;
+	ZUC_UINT32 K0;
 	ZUC_UINT32 K1, M;
 	ZUC_UINT31 *LFSR = ctx->LFSR;
-	ZUC_UINT32 R1 = ctx->R1;
-	ZUC_UINT32 R2 = ctx->R2;
+	ZUC_UINT32 R1;
+	ZUC_UINT32 R2;
 	ZUC_UINT32 X0, X1, X2, X3;
 	ZUC_UINT32 W1, W2, U, V;
 	size_t i;
@@ -456,11 +455,9 @@ void zuc_mac_finish(ZUC_MAC_CTX *ctx, const uint8_t *data, size_t nbits, uint8_t
 
 	T = ctx->T;
 	K0 = ctx->K0;
-	LFSR = ctx->LFSR;
 	R1 = ctx->R1;
 	R2 = ctx->R2;
 
-
 	if (nbits)
 		ctx->buf[ctx->buflen] = *data;
 
diff --git a/src/zuc_modes.c b/src/zuc_modes.c
index 75f89b73..afb4f946 100644
--- a/src/zuc_modes.c
+++ b/src/zuc_modes.c
@@ -119,7 +119,6 @@ int zuc_encrypt_update(ZUC_CTX *ctx, const uint8_t *in, size_t inlen, uint8_t *o
 		zuc_encrypt(&ctx->zuc_state, in, len, out);
 		in += len;
 		inlen -= len;
-		out += len;
 		*outlen += len;
 	}
 	if (inlen) {