libqtest: check for g_setenv() failure

g_setenv() can fail; check for it when starting a QEMU process
when we set the QEMU_AUDIO_DRV environment variable.

Because this happens after fork() reporting an exact message
via printf() is a bad idea; just exit(1), as we already do
for the case of execlp() failure.

Fixes: Coverity CID 1460117
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210820163750.9106-1-peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 825b13a..73f6b97 100644 (file)
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -301,7 +301,9 @@ QTestState *qtest_init_without_qmp_handshake(const char *extra_args)
     s->expected_status = 0;
     s->qemu_pid = fork();
     if (s->qemu_pid == 0) {
-        g_setenv("QEMU_AUDIO_DRV", "none", true);
+        if (!g_setenv("QEMU_AUDIO_DRV", "none", true)) {
+            exit(1);
+        }
         execlp("/bin/sh", "sh", "-c", command, NULL);
         exit(1);
     }