tpmdd fixes for Linux v5.3-rc2

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Merge tag 'tpmdd-next-20190805' of git://git.infradead.org/users/jjs/linux-tpmdd

Pull tpm fixes from Jarkko Sakkinen:
 "Two bug fixes that did not make into my first pull request"

* tag 'tpmdd-next-20190805' of git://git.infradead.org/users/jjs/linux-tpmdd:
  tpm: tpm_ibm_vtpm: Fix unallocated banks
  tpm: Fix null pointer dereference on chip register error path

drivers/char/tpm/tpm-chip.c

@@ -77,6 +77,18 @@ static int tpm_go_idle(struct tpm_chip *chip)
 	return chip->ops->go_idle(chip);
 }
 
+static void tpm_clk_enable(struct tpm_chip *chip)
+{
+	if (chip->ops->clk_enable)
+		chip->ops->clk_enable(chip, true);
+}
+
+static void tpm_clk_disable(struct tpm_chip *chip)
+{
+	if (chip->ops->clk_enable)
+		chip->ops->clk_enable(chip, false);
+}
+
 /**
  * tpm_chip_start() - power on the TPM
  * @chip:	a TPM chip to use
@@ -89,13 +101,12 @@ int tpm_chip_start(struct tpm_chip *chip)
 {
 	int ret;
 
-	if (chip->ops->clk_enable)
-		chip->ops->clk_enable(chip, true);
+	tpm_clk_enable(chip);
 
 	if (chip->locality == -1) {
 		ret = tpm_request_locality(chip);
 		if (ret) {
-			chip->ops->clk_enable(chip, false);
+			tpm_clk_disable(chip);
 			return ret;
 		}
 	}
@@ -103,8 +114,7 @@ int tpm_chip_start(struct tpm_chip *chip)
 	ret = tpm_cmd_ready(chip);
 	if (ret) {
 		tpm_relinquish_locality(chip);
-		if (chip->ops->clk_enable)
-			chip->ops->clk_enable(chip, false);
+		tpm_clk_disable(chip);
 		return ret;
 	}
 
@@ -124,8 +134,7 @@ void tpm_chip_stop(struct tpm_chip *chip)
 {
 	tpm_go_idle(chip);
 	tpm_relinquish_locality(chip);
-	if (chip->ops->clk_enable)
-		chip->ops->clk_enable(chip, false);
+	tpm_clk_disable(chip);
 }
 EXPORT_SYMBOL_GPL(tpm_chip_stop);
 
@@ -545,6 +554,20 @@ static int tpm_add_hwrng(struct tpm_chip *chip)
 	return hwrng_register(&chip->hwrng);
 }
 
+static int tpm_get_pcr_allocation(struct tpm_chip *chip)
+{
+	int rc;
+
+	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) ?
+	     tpm2_get_pcr_allocation(chip) :
+	     tpm1_get_pcr_allocation(chip);
+
+	if (rc > 0)
+		return -ENODEV;
+
+	return rc;
+}
+
 /*
  * tpm_chip_register() - create a character device for the TPM chip
  * @chip: TPM chip to use.
@@ -564,6 +587,12 @@ int tpm_chip_register(struct tpm_chip *chip)
 	if (rc)
 		return rc;
 	rc = tpm_auto_startup(chip);
+	if (rc) {
+		tpm_chip_stop(chip);
+		return rc;
+	}
+
+	rc = tpm_get_pcr_allocation(chip);
 	tpm_chip_stop(chip);
 	if (rc)
 		return rc;

drivers/char/tpm/tpm.h

@@ -394,6 +394,7 @@ int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
 ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 		    const char *desc, size_t min_cap_length);
 int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max);
+int tpm1_get_pcr_allocation(struct tpm_chip *chip);
 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 int tpm_pm_suspend(struct device *dev);
 int tpm_pm_resume(struct device *dev);
@@ -449,6 +450,7 @@ int tpm2_unseal_trusted(struct tpm_chip *chip,
 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 			u32 *value, const char *desc);
 
+ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
 int tpm2_auto_startup(struct tpm_chip *chip);
 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);

drivers/char/tpm/tpm1-cmd.c

@@ -699,18 +699,6 @@ int tpm1_auto_startup(struct tpm_chip *chip)
 		goto out;
 	}
 
-	chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks),
-					GFP_KERNEL);
-	if (!chip->allocated_banks) {
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	chip->allocated_banks[0].alg_id = TPM_ALG_SHA1;
-	chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1];
-	chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1;
-	chip->nr_allocated_banks = 1;
-
 	return rc;
 out:
 	if (rc > 0)
@@ -779,3 +767,27 @@ int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr)
 	return rc;
 }
 
+/**
+ * tpm1_get_pcr_allocation() - initialize the allocated bank
+ * @chip: TPM chip to use.
+ *
+ * The function initializes the SHA1 allocated bank to extend PCR
+ *
+ * Return:
+ * * 0 on success,
+ * * < 0 on error.
+ */
+int tpm1_get_pcr_allocation(struct tpm_chip *chip)
+{
+	chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks),
+					GFP_KERNEL);
+	if (!chip->allocated_banks)
+		return -ENOMEM;
+
+	chip->allocated_banks[0].alg_id = TPM_ALG_SHA1;
+	chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1];
+	chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1;
+	chip->nr_allocated_banks = 1;
+
+	return 0;
+}

drivers/char/tpm/tpm2-cmd.c

@@ -840,7 +840,7 @@ struct tpm2_pcr_selection {
 	u8  pcr_select[3];
 } __packed;
 
-static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
+ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
 {
 	struct tpm2_pcr_selection pcr_selection;
 	struct tpm_buf buf;
@@ -1040,10 +1040,6 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 			goto out;
 	}
 
-	rc = tpm2_get_pcr_allocation(chip);
-	if (rc)
-		goto out;
-
 	rc = tpm2_get_cc_attrs_tbl(chip);
 
 out: