tpm-passthrough: make it safer to destroy after creation

Check fds values before closing, to avoid close(-1).

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index 7371d507396406814c88d53771c1adaa61b71315..aa9167e3c65b176f625ef0ecc9f6fc7dbb36b4e0 100644 (file)
--- a/hw/tpm/tpm_passthrough.c
+++ b/hw/tpm/tpm_passthrough.c
@@ -347,8 +347,12 @@ static void tpm_passthrough_inst_finalize(Object *obj)
 
     tpm_passthrough_cancel_cmd(TPM_BACKEND(obj));
 
-    qemu_close(tpm_pt->tpm_fd);
-    qemu_close(tpm_pt->cancel_fd);
+    if (tpm_pt->tpm_fd >= 0) {
+        qemu_close(tpm_pt->tpm_fd);
+    }
+    if (tpm_pt->cancel_fd >= 0) {
+        qemu_close(tpm_pt->cancel_fd);
+    }
     qapi_free_TPMPassthroughOptions(tpm_pt->options);
 }