[PATCH] tpm: avoid NULL pointer dereference in tpm_tis_send()
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Fri Nov 26 23:54:52 CET 2021
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
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