tpm: fix NPE on probe for missing device
When using the tpm_tis-spi driver on a system missing the physical TPM,
a null pointer exception was observed.
[ 0.938677] Unable to handle kernel NULL pointer dereference at virtual address 00000004
[ 0.939020] pgd = 10c753cb
[ 0.939237] [00000004] *pgd=00000000
[ 0.939808] Internal error: Oops: 5 [#1] SMP ARM
[ 0.940157] CPU: 0 PID: 48 Comm: kworker/u4:1 Not tainted 5.15.10-dd1e40c #1
[ 0.940364] Hardware name: Generic DT based system
[ 0.940601] Workqueue: events_unbound async_run_entry_fn
[ 0.941048] PC is at tpm_tis_remove+0x28/0xb4
[ 0.941196] LR is at tpm_tis_core_init+0x170/0x6ac
This is due to an attempt in 'tpm_tis_remove' to use the drvdata, which
was not initialized in 'tpm_tis_core_init' prior to the first error.
Move the initialization of drvdata earlier so 'tpm_tis_remove' has
access to it.
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Fixes: 79ca6f74dae0 ("tpm: fix Atmel TPM crash caused by too frequent queries")
Cc: stable@vger.kernel.org
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 36d1ad8..dc56b97 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -950,6 +950,8 @@
priv->timeout_max = TPM_TIMEOUT_USECS_MAX;
priv->phy_ops = phy_ops;
+ dev_set_drvdata(&chip->dev, priv);
+
rc = tpm_tis_read32(priv, TPM_DID_VID(0), &vendor);
if (rc < 0)
return rc;
@@ -962,8 +964,6 @@
priv->timeout_max = TIS_TIMEOUT_MAX_ATML;
}
- dev_set_drvdata(&chip->dev, priv);
-
if (is_bsw()) {
priv->ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR,
ILB_REMAP_SIZE);
