[PATCH] tpm: avoid NULL pointer dereference in tpm_tis_send()

[Heinrich Schuchardt]

You should not dereference a pointer before checking if it is NULL.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 drivers/tpm/tpm2_tis_core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tpm/tpm2_tis_core.c b/drivers/tpm/tpm2_tis_core.c
index ec8c730fe9..0ff21a1ef7 100644
--- a/drivers/tpm/tpm2_tis_core.c
+++ b/drivers/tpm/tpm2_tis_core.c
@@ -218,7 +218,7 @@ static int tpm_tis_ready(struct udevice *dev)
 int tpm_tis_send(struct udevice *dev, const u8 *buf, size_t len)
 {
 	struct tpm_chip *chip = dev_get_priv(dev);
-	struct tpm_tis_phy_ops *phy_ops = chip->phy_ops;
+	struct tpm_tis_phy_ops *phy_ops;
 	size_t burstcnt, wr_size, sent = 0;
 	u8 data = TPM_STS_GO;
 	u8 status;
@@ -227,6 +227,8 @@ int tpm_tis_send(struct udevice *dev, const u8 *buf, size_t len)
 	if (!chip)
 		return -ENODEV;
 
+	phy_ops = chip->phy_ops;
+
 	ret = tpm_tis_request_locality(dev, 0);
 	if (ret < 0)
 		return -EBUSY;
-- 
2.32.0