Change in coreboot[master]: security/tpm: Check for NULL pointer

[Philipp Deppenwiese (Code Review)]

Philipp Deppenwiese has submitted this change and it was merged. ( https://review.coreboot.org/27933 )

Change subject: security/tpm: Check for NULL pointer
......................................................................

security/tpm: Check for NULL pointer

Change bce49c2 (security/tpm: Improve TCPA log generation) missed
checking for NULL pointer before accessing the tcpa_table returned by
tcpa_log_init. This change fixes the boot hang observed on octopus by
ensuring pointer is checked for NULL before using it.

BUG=b:111403731
TEST=Verified that octopus boots up fine.

Change-Id: I2e46197065f8db1dc028a85551546263e60d46b2
Signed-off-by: Furquan Shaikh 
Reviewed-on: https://review.coreboot.org/27933
Tested-by: build bot (Jenkins) 
Reviewed-by: Justin TerAvest 
Reviewed-by: Aaron Durbin 
---
M src/security/tpm/tspi/log.c
1 file changed, 4 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Aaron Durbin: Looks good to me, approved
  Justin TerAvest: Looks good to me, approved

diff --git a/src/security/tpm/tspi/log.c b/src/security/tpm/tspi/log.c
index 0a6655a..17f6f1f 100644
--- a/src/security/tpm/tspi/log.c
+++ b/src/security/tpm/tspi/log.c
@@ -57,6 +57,10 @@
    struct tcpa_entry *tce;

tclt = tcpa_log_init();
+
+	if (!tclt)
+		return;
+
    if (tclt->num_entries == tclt->max_entries) {
    	printk(BIOS_WARNING, "ERROR: TCPA log table is full\n");
    	return;