diff mbox series

[v2,3/3] tpm: tpm_tis: Add the missed acpi_put_table() to fix memory leak

Message ID 1668684222-38457-4-git-send-email-guohanjun@huawei.com (mailing list archive)
State New
Headers show
Series ACPI table release for TPM drivers | expand

Commit Message

Hanjun Guo Nov. 17, 2022, 11:23 a.m. UTC
In check_acpi_tpm2(), we get the TPM2 table just to make
sure the table is there, not used after the init, so the
acpi_put_table() should be added to release the ACPI memory.

Fixes: 4cb586a188d4 ("tpm_tis: Consolidate the platform and acpi probe flow")
Cc: stable@vger.kernel.org
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
---
 drivers/char/tpm/tpm_tis.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Comments

Jarkko Sakkinen Nov. 27, 2022, 5:21 p.m. UTC | #1
On Thu, Nov 17, 2022 at 07:23:42PM +0800, Hanjun Guo wrote:
> In check_acpi_tpm2(), we get the TPM2 table just to make
> sure the table is there, not used after the init, so the
> acpi_put_table() should be added to release the ACPI memory.
> 
> Fixes: 4cb586a188d4 ("tpm_tis: Consolidate the platform and acpi probe flow")
> Cc: stable@vger.kernel.org
> Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
> ---
>  drivers/char/tpm/tpm_tis.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index bcff642..ed5dabd 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -125,6 +125,7 @@ static int check_acpi_tpm2(struct device *dev)
>  	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
>  	struct acpi_table_tpm2 *tbl;
>  	acpi_status st;
> +	int ret = 0;
>  
>  	if (!aid || aid->driver_data != DEVICE_IS_TPM2)
>  		return 0;
> @@ -132,8 +133,7 @@ static int check_acpi_tpm2(struct device *dev)
>  	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
>  	 * table is mandatory
>  	 */
> -	st =
> -	    acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
> +	st = acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
>  	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
>  		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
>  		return -EINVAL;
> @@ -141,9 +141,10 @@ static int check_acpi_tpm2(struct device *dev)
>  
>  	/* The tpm2_crb driver handles this device */
>  	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
> -		return -ENODEV;
> +		ret = -ENODEV;
>  
> -	return 0;
> +	acpi_put_table((struct acpi_table_header *)tbl);
> +	return ret;
>  }
>  #else
>  static int check_acpi_tpm2(struct device *dev)
> -- 
> 1.7.12.4
> 

Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

BR, Jarkko
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index bcff642..ed5dabd 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -125,6 +125,7 @@  static int check_acpi_tpm2(struct device *dev)
 	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
 	struct acpi_table_tpm2 *tbl;
 	acpi_status st;
+	int ret = 0;
 
 	if (!aid || aid->driver_data != DEVICE_IS_TPM2)
 		return 0;
@@ -132,8 +133,7 @@  static int check_acpi_tpm2(struct device *dev)
 	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
 	 * table is mandatory
 	 */
-	st =
-	    acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
+	st = acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
 	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
 		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
 		return -EINVAL;
@@ -141,9 +141,10 @@  static int check_acpi_tpm2(struct device *dev)
 
 	/* The tpm2_crb driver handles this device */
 	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
-		return -ENODEV;
+		ret = -ENODEV;
 
-	return 0;
+	acpi_put_table((struct acpi_table_header *)tbl);
+	return ret;
 }
 #else
 static int check_acpi_tpm2(struct device *dev)