linux-kernel - [PATCH v2 1/2] tpm: Use managed allocation for bios event log

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Message-Id: <20230113161017.1079299-2-eajames@linux.ibm.com>
Date:   Fri, 13 Jan 2023 10:10:16 -0600
From:   Eddie James <eajames@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jgg@...pe.ca, jarkko@...nel.org,
        peterhuewe@....de, Eddie James <eajames@...ux.ibm.com>
Subject: [PATCH v2 1/2] tpm: Use managed allocation for bios event log

Since the bios event log is freed in the device release function,
let devres handle the deallocation. This will allow other memory
allocation/mapping functions to be used for the bios event log.

Signed-off-by: Eddie James <eajames@...ux.ibm.com>
---
 drivers/char/tpm/eventlog/acpi.c |  5 +++--
 drivers/char/tpm/eventlog/efi.c  | 13 +++++++------
 drivers/char/tpm/eventlog/of.c   |  3 ++-
 drivers/char/tpm/tpm-chip.c      |  1 -
 4 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
index 0913d3eb8d51..40360e599bc3 100644
--- a/drivers/char/tpm/eventlog/acpi.c
+++ b/drivers/char/tpm/eventlog/acpi.c
@@ -14,6 +14,7 @@
  * Access to the event log extended by the TCG BIOS of PC platform
  */
 
+#include <linux/device.h>
 #include <linux/seq_file.h>
 #include <linux/fs.h>
 #include <linux/security.h>
@@ -135,7 +136,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
 	}
 
 	/* malloc EventLog space */
-	log->bios_event_log = kmalloc(len, GFP_KERNEL);
+	log->bios_event_log = devm_kmalloc(&chip->dev, len, GFP_KERNEL);
 	if (!log->bios_event_log)
 		return -ENOMEM;
 
@@ -160,7 +161,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
 	return format;
 
 err:
-	kfree(log->bios_event_log);
+	devm_kfree(&chip->dev, log->bios_event_log);
 	log->bios_event_log = NULL;
 	return ret;
 }
diff --git a/drivers/char/tpm/eventlog/efi.c b/drivers/char/tpm/eventlog/efi.c
index e6cb9d525e30..4e9d7c2bf32e 100644
--- a/drivers/char/tpm/eventlog/efi.c
+++ b/drivers/char/tpm/eventlog/efi.c
@@ -6,6 +6,7 @@
  *      Thiebaud Weksteen <tweek@...gle.com>
  */
 
+#include <linux/device.h>
 #include <linux/efi.h>
 #include <linux/tpm_eventlog.h>
 
@@ -55,7 +56,7 @@ int tpm_read_log_efi(struct tpm_chip *chip)
 	}
 
 	/* malloc EventLog space */
-	log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
+	log->bios_event_log = devm_kmemdup(&chip->dev, log_tbl->log, log_size, GFP_KERNEL);
 	if (!log->bios_event_log) {
 		ret = -ENOMEM;
 		goto out;
@@ -76,7 +77,7 @@ int tpm_read_log_efi(struct tpm_chip *chip)
 			     MEMREMAP_WB);
 	if (!final_tbl) {
 		pr_err("Could not map UEFI TPM final log\n");
-		kfree(log->bios_event_log);
+		devm_kfree(&chip->dev, log->bios_event_log);
 		ret = -ENOMEM;
 		goto out;
 	}
@@ -91,11 +92,11 @@ int tpm_read_log_efi(struct tpm_chip *chip)
 	 * Allocate memory for the 'combined log' where we will append the
 	 * 'final events log' to.
 	 */
-	tmp = krealloc(log->bios_event_log,
-		       log_size + final_events_log_size,
-		       GFP_KERNEL);
+	tmp = devm_krealloc(&chip->dev, log->bios_event_log,
+			    log_size + final_events_log_size,
+			    GFP_KERNEL);
 	if (!tmp) {
-		kfree(log->bios_event_log);
+		devm_kfree(&chip->dev, log->bios_event_log);
 		ret = -ENOMEM;
 		goto out;
 	}
diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c
index a9ce66d09a75..741ab2204b11 100644
--- a/drivers/char/tpm/eventlog/of.c
+++ b/drivers/char/tpm/eventlog/of.c
@@ -10,6 +10,7 @@
  * Read the event log created by the firmware on PPC64
  */
 
+#include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/tpm_eventlog.h>
@@ -65,7 +66,7 @@ int tpm_read_log_of(struct tpm_chip *chip)
 		return -EIO;
 	}
 
-	log->bios_event_log = kmemdup(__va(base), size, GFP_KERNEL);
+	log->bios_event_log = devm_kmemdup(&chip->dev, __va(base), size, GFP_KERNEL);
 	if (!log->bios_event_log)
 		return -ENOMEM;
 
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 741d8f3e8fb3..b99f55f2d4fd 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -267,7 +267,6 @@ static void tpm_dev_release(struct device *dev)
 	idr_remove(&dev_nums_idr, chip->dev_num);
 	mutex_unlock(&idr_lock);
 
-	kfree(chip->log.bios_event_log);
 	kfree(chip->work_space.context_buf);
 	kfree(chip->work_space.session_buf);
 	kfree(chip->allocated_banks);
-- 
2.31.1