diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16d71979a..81fa6cb89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,8 +137,8 @@ if(CMAKE_COMPILER_IS_GNU)
     set(CMAKE_C_FLAGS_RELEASE     "-O2")
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
-    set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -O3")
-    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
+    set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O3")
+    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls")
     set(CMAKE_C_FLAGS_CHECK       "-Werror -Os")
     set(CMAKE_C_FLAGS_CHECKFULL   "${CMAKE_C_FLAGS_CHECK} -Wcast-qual")
 endif(CMAKE_COMPILER_IS_GNU)
@@ -149,7 +149,7 @@ if(CMAKE_COMPILER_IS_CLANG)
     set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
     set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
     set(CMAKE_C_FLAGS_ASAN        "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O3")
-    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls ")
+    set(CMAKE_C_FLAGS_ASANDBG     "-Werror -fsanitize=address -fno-common -fsanitize=undefined -fno-sanitize-recover=all -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls")
     set(CMAKE_C_FLAGS_MEMSAN      "-Werror -fsanitize=memory -O3")
     set(CMAKE_C_FLAGS_MEMSANDBG   "-Werror -fsanitize=memory -O1 -g3 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fsanitize-memory-track-origins=2")
     set(CMAKE_C_FLAGS_CHECK       "-Werror -Os")
diff --git a/library/psa_its_file.c b/library/psa_its_file.c
index 05ca8afc7..0935b2780 100644
--- a/library/psa_its_file.c
+++ b/library/psa_its_file.c
@@ -214,9 +214,12 @@ psa_status_t psa_its_set( psa_storage_uid_t uid,
     n = fwrite( &header, 1, sizeof( header ), stream );
     if( n != sizeof( header ) )
         goto exit;
-    n = fwrite( p_data, 1, data_length, stream );
-    if( n != data_length )
-        goto exit;
+    if( data_length != 0 )
+    {
+        n = fwrite( p_data, 1, data_length, stream );
+        if( n != data_length )
+            goto exit;
+    }
     status = PSA_SUCCESS;
 
 exit:
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 244fdc327..20458af2c 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -701,7 +701,7 @@ component_test_no_use_psa_crypto_full_cmake_asan() {
     # full minus MBEDTLS_USE_PSA_CRYPTO: run the same set of tests as basic-build-test.sh
     msg "build: cmake, full config + MBEDTLS_USE_PSA_CRYPTO, ASan"
     scripts/config.pl full
-    scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
+    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
     scripts/config.pl set MBEDTLS_ECP_RESTARTABLE  # not using PSA, so enable restartable ECC
     scripts/config.pl set MBEDTLS_PSA_CRYPTO_C
     scripts/config.pl unset MBEDTLS_USE_PSA_CRYPTO