diff --git a/library/ecp.c b/library/ecp.c
index 725ecc65f..b120adf74 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -2141,11 +2141,25 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
     int ret;
     unsigned char w, p_eq_g, i;
     size_t d;
-    unsigned char T_size, T_ok;
-    mbedtls_ecp_point *T;
+    unsigned char T_size = 0, T_ok = 0;
+    mbedtls_ecp_point *T = NULL;
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    ecp_drbg_context drbg_ctx;
+
+    ecp_drbg_init( &drbg_ctx );
+#endif
 
     ECP_RS_ENTER( rsm );
 
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    if( f_rng == NULL )
+    {
+        MBEDTLS_MPI_CHK( ecp_drbg_seed( &drbg_ctx, m ) );
+        f_rng = &ecp_drbg_random;
+        p_rng = &drbg_ctx;
+    }
+#endif /* !MBEDTLS_ECP_NO_INTERNAL_RNG */
+
     /* Is P the base point ? */
 #if MBEDTLS_ECP_FIXED_POINT_OPTIM == 1
     p_eq_g = ( mbedtls_mpi_cmp_mpi( &P->Y, &grp->G.Y ) == 0 &&
@@ -2217,6 +2231,10 @@ static int ecp_mul_comb( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
 
 cleanup:
 
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    ecp_drbg_free( &drbg_ctx );
+#endif
+
     /* does T belong to the group? */
     if( T == grp->T )
         T = NULL;
@@ -2407,9 +2425,22 @@ static int ecp_mul_mxz( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
     unsigned char b;
     mbedtls_ecp_point RP;
     mbedtls_mpi PX;
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    ecp_drbg_context drbg_ctx;
 
+    ecp_drbg_init( &drbg_ctx );
+#endif
     mbedtls_ecp_point_init( &RP ); mbedtls_mpi_init( &PX );
 
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    if( f_rng == NULL )
+    {
+        MBEDTLS_MPI_CHK( ecp_drbg_seed( &drbg_ctx, m ) );
+        f_rng = &ecp_drbg_random;
+        p_rng = &drbg_ctx;
+    }
+#endif /* !MBEDTLS_ECP_NO_INTERNAL_RNG */
+
     /* Save PX and read from P before writing to R, in case P == R */
     MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &PX, &P->X ) );
     MBEDTLS_MPI_CHK( mbedtls_ecp_copy( &RP, P ) );
@@ -2462,6 +2493,10 @@ static int ecp_mul_mxz( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
     MBEDTLS_MPI_CHK( ecp_normalize_mxz( grp, R ) );
 
 cleanup:
+#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
+    ecp_drbg_free( &drbg_ctx );
+#endif
+
     mbedtls_ecp_point_free( &RP ); mbedtls_mpi_free( &PX );
 
     return( ret );
@@ -2480,19 +2515,12 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
     int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
 #if defined(MBEDTLS_ECP_INTERNAL_ALT)
     char is_grp_capable = 0;
-#endif
-#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-    ecp_drbg_context drbg_ctx;
 #endif
     ECP_VALIDATE_RET( grp != NULL );
     ECP_VALIDATE_RET( R   != NULL );
     ECP_VALIDATE_RET( m   != NULL );
     ECP_VALIDATE_RET( P   != NULL );
 
-#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-    ecp_drbg_init( &drbg_ctx );
-#endif /* !MBEDTLS_ECP_NO_INTERNAL_RNG */
-
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     /* reset ops count for this call if top-level */
     if( rs_ctx != NULL && rs_ctx->depth++ == 0 )
@@ -2504,15 +2532,6 @@ int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
         MBEDTLS_MPI_CHK( mbedtls_internal_ecp_init( grp ) );
 #endif /* MBEDTLS_ECP_INTERNAL_ALT */
 
-#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-    if( f_rng == NULL )
-    {
-        MBEDTLS_MPI_CHK( ecp_drbg_seed( &drbg_ctx, m ) );
-        f_rng = &ecp_drbg_random;
-        p_rng = &drbg_ctx;
-    }
-#endif /* !MBEDTLS_ECP_NO_INTERNAL_RNG */
-
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     /* skip argument check when restarting */
     if( rs_ctx == NULL || rs_ctx->rsm == NULL )
@@ -2543,10 +2562,6 @@ cleanup:
         mbedtls_internal_ecp_free( grp );
 #endif /* MBEDTLS_ECP_INTERNAL_ALT */
 
-#if !defined(MBEDTLS_ECP_NO_INTERNAL_RNG)
-    ecp_drbg_free( &drbg_ctx );
-#endif
-
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     if( rs_ctx != NULL )
         rs_ctx->depth--;