Re: [Qemu-devel] [PATCH 32/42] tpm-passthrough: make it safer to destroy after creation

[Stefan Berger]

On 10/09/2017 06:56 PM, Marc-André Lureau wrote:
Check fds values before closing, to avoid close(-1).
Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>

Typicall free() can be called with a NULL pointer.  I am also fine with 
this change here,  but could we move the fd < 0 check into qemu_close?

Reviewed-by: Stefan Berger <stef...@linux.vnet.ibm.com>

---
  hw/tpm/tpm_passthrough.c | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/tpm/tpm_passthrough.c b/hw/tpm/tpm_passthrough.c
index 7371d50739..aa9167e3c6 100644
--- 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);
  }