diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 5ccebebde6..82b018813e 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -55,7 +55,7 @@
  * Low-level module errors (0x0002-0x007E, 0x0001-0x007F)
  *
  * Module   Nr  Codes assigned
- * ERROR     2         0x006E   0x0001
+ * ERROR     2  0x006E          0x0001
  * MPI       7  0x0002-0x0010
  * GCM       3  0x0012-0x0014   0x0013-0x0013
  * BLOWFISH  3  0x0016-0x0018   0x0017-0x0017
diff --git a/library/error.c b/library/error.c
index 85beaeeacc..27305b56fc 100644
--- a/library/error.c
+++ b/library/error.c
@@ -25,8 +25,7 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
-#if defined(MBEDTLS_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
-#include "mbedtls/error.h"
+#if defined(MBEDTLS_ERROR_STRERROR_DUMMY)
 #include <string.h>
 #endif
 
diff --git a/programs/aes/aescrypt2.c b/programs/aes/aescrypt2.c
index 8242ea7c9e..048028df09 100644
--- a/programs/aes/aescrypt2.c
+++ b/programs/aes/aescrypt2.c
@@ -96,7 +96,7 @@ int main( int argc, char *argv[] )
     unsigned char IV[16];
     unsigned char tmp[16];
     unsigned char key[512];
-    unsigned char digest[32];
+    unsigned char digest[64];
     unsigned char buffer[1024];
     unsigned char diff;
 
diff --git a/scripts/config.pl b/scripts/config.pl
index 95e31913a2..c836b37af5 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -19,9 +19,9 @@
 ## This file is part of Mbed TLS (https://tls.mbed.org)
 
 my $py = $0;
-$py =~ s/\.pl$/.py/;
+$py =~ s/\.pl$/.py/ or die "Unable to determine the name of the Python script";
 exec 'python3', $py, @ARGV;
-print STDERR "$0: python3: $!\n";
+print STDERR "$0: python3: $!. Trying python instead.\n";
 exec 'python', $py, @ARGV;
 print STDERR "$0: python: $!\n";
 exit 127;
diff --git a/scripts/data_files/error.fmt b/scripts/data_files/error.fmt
index a08742c83b..63607054ed 100644
--- a/scripts/data_files/error.fmt
+++ b/scripts/data_files/error.fmt
@@ -25,8 +25,7 @@
 #include MBEDTLS_CONFIG_FILE
 #endif
 
-#if defined(MBEDTLS_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
-#include "mbedtls/error.h"
+#if defined(MBEDTLS_ERROR_STRERROR_DUMMY)
 #include <string.h>
 #endif
 
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 3e68c06571..f38502f550 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -311,11 +311,11 @@ typedef enum
 #define TEST_VALID_PARAM( TEST )                                    \
     TEST_ASSERT( ( TEST, 1 ) );
 
-#define TEST_HELPER_ASSERT(a) if( !( a ) )                                      \
+#define TEST_HELPER_ASSERT(a) if( !( a ) )                          \
 {                                                                   \
-    mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n",   \
+    mbedtls_fprintf( stderr, "Assertion Failed at %s:%d - %s\n",    \
                              __FILE__, __LINE__, #a );              \
-    mbedtls_exit( 1 );                                             \
+    mbedtls_exit( 1 );                                              \
 }
 
 #if defined(__GNUC__)
@@ -370,6 +370,38 @@ typedef enum
  */
 #define MAX( x, y ) ( ( x ) > ( y ) ? ( x ) : ( y ) )
 
+/** Allocate memory dynamically and fail the test case if this fails.
+ *
+ * You must set \p pointer to \c NULL before calling this macro and
+ * put `mbedtls_free( pointer )` in the test's cleanup code.
+ *
+ * If \p length is zero, the resulting \p pointer will be \c NULL.
+ * This is usually what we want in tests since API functions are
+ * supposed to accept null pointers when a buffer size is zero.
+ *
+ * This macro expands to an instruction, not an expression.
+ * It may jump to the \c exit label.
+ *
+ * \param pointer   An lvalue where the address of the allocated buffer
+ *                  will be stored.
+ *                  This expression may be evaluated multiple times.
+ * \param length    Number of elements to allocate.
+ *                  This expression may be evaluated multiple times.
+ *
+ */
+#define ASSERT_ALLOC( pointer, length )                           \
+    do                                                            \
+    {                                                             \
+        TEST_ASSERT( ( pointer ) == NULL );                       \
+        if( ( length ) != 0 )                                     \
+        {                                                         \
+            ( pointer ) = mbedtls_calloc( sizeof( *( pointer ) ), \
+                                          ( length ) );           \
+            TEST_ASSERT( ( pointer ) != NULL );                   \
+        }                                                         \
+    }                                                             \
+    while( 0 )
+
 /*
  * 32-bit integer manipulation macros (big endian)
  */
diff --git a/tests/suites/host_test.function b/tests/suites/host_test.function
index a87dc139c0..646734081c 100644
--- a/tests/suites/host_test.function
+++ b/tests/suites/host_test.function
@@ -525,15 +525,6 @@ int execute_tests( int argc , const char ** argv )
     mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof( alloc_buf ) );
 #endif
 
-    if( outcome_file_name != NULL )
-    {
-        outcome_file = fopen( outcome_file_name, "a" );
-        if( outcome_file == NULL )
-        {
-            mbedtls_fprintf( stderr, "Unable to open outcome file. Continuing anyway.\n" );
-        }
-    }
-
     /*
      * The C standard doesn't guarantee that all-bits-0 is the representation
      * of a NULL pointer. We do however use that in our code for initializing
@@ -555,6 +546,15 @@ int execute_tests( int argc , const char ** argv )
         return( 1 );
     }
 
+    if( outcome_file_name != NULL )
+    {
+        outcome_file = fopen( outcome_file_name, "a" );
+        if( outcome_file == NULL )
+        {
+            mbedtls_fprintf( stderr, "Unable to open outcome file. Continuing anyway.\n" );
+        }
+    }
+
     while( arg_index < argc )
     {
         next_arg = argv[arg_index];
@@ -607,6 +607,8 @@ int execute_tests( int argc , const char ** argv )
         {
             mbedtls_fprintf( stderr, "Failed to open test file: %s\n",
                              test_filename );
+            if( outcome_file != NULL )
+                fclose( outcome_file );
             return( 1 );
         }