tests/qtest/migration/tls-tests.c: Don't use tls_psk end hook for no_tls tests

If you run the TLS tests under a clang undefined-behaviour sanitizer build
it will fall over like this:

../../tests/unit/crypto-tls-psk-helpers.c:53:12: runtime error: null pointer passed as argument 1, which is declared to never be null
/usr/include/unistd.h:858:48: note: nonnull attribute specified here
    #0 0x62bd810762ee in test_tls_psk_cleanup /home/pm215/qemu/build/clang/../../tests/unit/crypto-tls-psk-helpers.c:53:5
    #1 0x62bd81073f89 in migrate_hook_end_tls_psk /home/pm215/qemu/build/clang/../../tests/qtest/migration/tls-tests.c:101:5
    #2 0x62bd81062ef0 in test_precopy_common /home/pm215/qemu/build/clang/../../tests/qtest/migration/framework.c:947:9

This happens because test_precopy_tcp_no_tls() uses a custom start_hook
that only sets a couple of parameters, but reuses the tsk_psk end_hook.
However, the end_hook runs cleanup that assumes that the data was set
up by migrate_hook_start_tls_psk_common(). In particular, it will
unconditionally call test_tls_psk_cleanup(data->pskfile), and
test_tls_psk_cleanup() will unconditionally unlink() the filename it
is passed, which is undefined behaviour if you pass it a NULL pointer.

Instead of creating a TestMigrateTLSPSKData struct which we never set
any fields in and requiring the migrate_hook_end_tls_psk() hook to
cope with that, don't allocate the struct in the start_hook. Then
there is nothing we need to clean up, and we can set the end_hook
to NULL (which the test framework will interpret as "don't call
any end_hook").

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260212114747.1103466-1-peter.maydell@linaro.org
[no need to copy stable]
Signed-off-by: Fabiano Rosas <farosas@suse.de>

diff --git a/tests/qtest/migration/tls-tests.c b/tests/qtest/migration/tls-tests.c
index bf0bb06a299e98f2f9258b9dc9b4ad2774ef1755..4ce7f6c6765c651d405f5fcb6fd1b0653ef6e871 100644 (file)
--- a/tests/qtest/migration/tls-tests.c
+++ b/tests/qtest/migration/tls-tests.c
@@ -488,20 +488,18 @@ static void test_precopy_tcp_tls_psk_mismatch(char *name, MigrateCommon *args)
 
 static void *migrate_hook_start_no_tls(QTestState *from, QTestState *to)
 {
-    struct TestMigrateTLSPSKData *data =
-        g_new0(struct TestMigrateTLSPSKData, 1);
-
     migrate_set_parameter_null(from, "tls-creds");
     migrate_set_parameter_null(to, "tls-creds");
 
-    return data;
+    return NULL;
 }
 
 static void test_precopy_tcp_no_tls(char *name, MigrateCommon *args)
 {
     args->listen_uri = "tcp:127.0.0.1:0";
     args->start_hook = migrate_hook_start_no_tls;
-    args->end_hook = migrate_hook_end_tls_psk;
+    /* the no_tls start hook requires no cleanup actions */
+    args->end_hook = NULL;
 
     test_precopy_common(args);
 }