[PATCH] tpm: Check the bios_dir entry for NULL before accessing it

[Stefan Berger <stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>]

Check the bios_dir entry for NULL before accessing it. Currently
this crashes the driver when a TPM 2 is attached and the entries
are NULL.

Signed-off-by: Stefan Berger <stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
 drivers/char/tpm/tpm_eventlog.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index ebec4ac..fb603a7 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -455,10 +455,12 @@ void tpm_bios_log_teardown(struct tpm_chip *chip)
 	 * This design ensures that open() either safely gets kref or fails.
 	 */
 	for (i = (TPM_NUM_EVENT_LOG_FILES - 1); i >= 0; i--) {
-		inode = d_inode(chip->bios_dir[i]);
-		inode_lock(inode);
-		inode->i_private = NULL;
-		inode_unlock(inode);
-		securityfs_remove(chip->bios_dir[i]);
+		if (chip->bios_dir[i]) {
+			inode = d_inode(chip->bios_dir[i]);
+			inode_lock(inode);
+			inode->i_private = NULL;
+			inode_unlock(inode);
+			securityfs_remove(chip->bios_dir[i]);
+		}
 	}
 }
-- 
2.4.3


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