Add a return value to hasher_t.get_hash()

src/libcharon/plugins/coupling/coupling_validator.c

@@ -70,7 +70,11 @@ static bool get_cert_hash(private_coupling_validator_t *this,
 	{
 		return FALSE;
 	}
-	this->hasher->get_hash(this->hasher, encoding, buf);
+	if (!this->hasher->get_hash(this->hasher, encoding, buf))
+	{
+		free(encoding.ptr);
+		return FALSE;
+	}
 	free(encoding.ptr);
 	chunk_to_hex(chunk_create(buf, this->hasher->get_hash_size(this->hasher)),
 				 hex, FALSE);

src/libcharon/plugins/tnc_pdp/tnc_pdp.c

@@ -231,8 +231,12 @@ static chunk_t encrypt_mppe_key(private_tnc_pdp_t *this, u_int8_t type,
 	while (c < data.ptr + data.len)
 	{
 		/* b(i) = MD5(S + c(i-1)) */
-		this->hasher->get_hash(this->hasher, this->secret, NULL);
-		this->hasher->get_hash(this->hasher, seed, b);
+		if (!this->hasher->get_hash(this->hasher, this->secret, NULL) ||
+			!this->hasher->get_hash(this->hasher, seed, b))
+		{
+			free(data.ptr);
+			return chunk_empty;
+		}
 
 		/* c(i) = b(i) xor p(1) */
 		memxor(c, b, HASH_SIZE_MD5);