[Qemu-devel] [PATCH 2/2] tpm: Make sure new locality passed to tpm_tis_prep_abort() is valid

[Stefan Berger <stefanb@linux.vnet.ibm.com>]

Make sure that the new locality passed to tpm_tis_prep_abort()
is valid. This is merely a precaution since none of the current
callers passes an invalid locality number into this function.

Add a comment to aborting_locty that it may be any locality, including
TPM_TIS_NO_LOCALITY.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 hw/tpm/tpm_tis.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_tis.c b/hw/tpm/tpm_tis.c
index 176d424ed9..6e78efa9a3 100644
--- a/hw/tpm/tpm_tis.c
+++ b/hw/tpm/tpm_tis.c
@@ -263,7 +263,10 @@ static void tpm_tis_prep_abort(TPMState *s, uint8_t locty, uint8_t newlocty)
 {
     uint8_t busy_locty;
 
-    s->aborting_locty = locty;
+    if (!TPM_TIS_IS_VALID_LOCTY(newlocty))
+        return
+
+    s->aborting_locty = locty; /* may also be TPM_TIS_NO_LOCALITY */
     s->next_locty = newlocty;  /* locality after successful abort */
 
     /*
-- 
2.17.1