diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 7b9daae..f050abf 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -7174,6 +7174,7 @@
     size_t signature_size;
     size_t signature_length = 0xdeadbeef;
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
+    uint8_t *input_buffer = NULL;
     psa_sign_hash_interruptible_operation_t sign_operation =
         psa_sign_hash_interruptible_operation_init();
     psa_verify_hash_interruptible_operation_t verify_operation =
@@ -7351,6 +7352,45 @@
 
     PSA_ASSERT(psa_sign_hash_abort(&sign_operation));
 
+    /* Trash the hash buffer in between start and complete, to ensure
+     * no reliance on external buffers. */
+    psa_interruptible_set_max_ops(PSA_INTERRUPTIBLE_MAX_OPS_UNLIMITED);
+
+    input_buffer = mbedtls_calloc(1, input_data->len);
+    TEST_ASSERT(input_buffer != NULL);
+
+    memcpy(input_buffer, input_data->x, input_data->len);
+
+    PSA_ASSERT(psa_sign_hash_start(&sign_operation, key, alg,
+                                   input_buffer, input_data->len));
+
+    memset(input_buffer, '!', input_data->len);
+    mbedtls_free(input_buffer);
+    input_buffer = NULL;
+
+    PSA_ASSERT(psa_sign_hash_complete(&sign_operation, signature,
+                                      signature_size,
+                                      &signature_length));
+
+    PSA_ASSERT(psa_sign_hash_abort(&sign_operation));
+
+    input_buffer = mbedtls_calloc(1, input_data->len);
+    TEST_ASSERT(input_buffer != NULL);
+
+    memcpy(input_buffer, input_data->x, input_data->len);
+
+    PSA_ASSERT(psa_verify_hash_start(&verify_operation, key, alg,
+                                     input_buffer, input_data->len,
+                                     signature, signature_length));
+
+    memset(input_buffer, '!', input_data->len);
+    mbedtls_free(input_buffer);
+    input_buffer = NULL;
+
+    PSA_ASSERT(psa_verify_hash_complete(&verify_operation));
+
+    PSA_ASSERT(psa_verify_hash_abort(&verify_operation));
+
 exit:
     /*
      * Key attributes may have been returned by psa_get_key_attributes()