Ensure valid context is used in fuzz_dtlsserver
A valid ctr_drbg context is now a prerequisite for using dummy_random()
@@ -44,6 +44,13 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
unsigned char buf[4096];
fuzzBufferOffset_t biomemfuzz;
+ mbedtls_ctr_drbg_init( &ctr_drbg );
+ mbedtls_entropy_init( &entropy );
+
+ if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
+ ( const unsigned char * ) pers, strlen( pers ) ) != 0 )
+ goto exit;
+
if (initialized == 0) {
#if defined(MBEDTLS_X509_CRT_PARSE_C) && defined(MBEDTLS_PEM_PARSE_C)
mbedtls_x509_crt_init( &srvcert );
@@ -56,7 +63,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
return 1;
if (mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0,
- dummy_random, NULL ) != 0)
+ dummy_random, &ctr_drbg ) != 0)
return 1;
#endif
dummy_init();
@@ -65,15 +72,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
}
mbedtls_ssl_init( &ssl );
mbedtls_ssl_config_init( &conf );
- mbedtls_ctr_drbg_init( &ctr_drbg );
- mbedtls_entropy_init( &entropy );
mbedtls_ssl_cookie_init( &cookie_ctx );
- if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
- (const unsigned char *) pers, strlen( pers ) ) != 0 )
- goto exit;
-
-
if( mbedtls_ssl_config_defaults( &conf,
MBEDTLS_SSL_IS_SERVER,
MBEDTLS_SSL_TRANSPORT_DATAGRAM,
