tpm: tpm_crb: Add the missed acpi_put_table() to fix memory leak

commit 37e90c374dd11cf4919c51e847c6d6ced0abc555 upstream.

In crb_acpi_add(), we get the TPM2 table to retrieve information
like start method, and then assign them to the priv data, so the
TPM2 table is not used after the init, should be freed, call
acpi_put_table() to fix the memory leak.

Fixes: 30fc8d138e91 ("tpm: TPM 2.0 CRB Interface")
Cc: stable@vger.kernel.org
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 65f8f17..16fc481 100644 (file)
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -676,12 +676,16 @@ static int crb_acpi_add(struct acpi_device *device)
 
        /* Should the FIFO driver handle this? */
        sm = buf->start_method;
-       if (sm == ACPI_TPM2_MEMORY_MAPPED)
-               return -ENODEV;
+       if (sm == ACPI_TPM2_MEMORY_MAPPED) {
+               rc = -ENODEV;
+               goto out;
+       }
 
        priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL);
-       if (!priv)
-               return -ENOMEM;
+       if (!priv) {
+               rc = -ENOMEM;
+               goto out;
+       }
 
        if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
                if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
@@ -689,7 +693,8 @@ static int crb_acpi_add(struct acpi_device *device)
                                FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
                                buf->header.length,
                                ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
-                       return -EINVAL;
+                       rc = -EINVAL;
+                       goto out;
                }
                crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
                priv->smc_func_id = crb_smc->smc_func_id;
@@ -700,17 +705,23 @@ static int crb_acpi_add(struct acpi_device *device)
 
        rc = crb_map_io(device, priv, buf);
        if (rc)
-               return rc;
+               goto out;
 
        chip = tpmm_chip_alloc(dev, &tpm_crb);
-       if (IS_ERR(chip))
-               return PTR_ERR(chip);
+       if (IS_ERR(chip)) {
+               rc = PTR_ERR(chip);
+               goto out;
+       }
 
        dev_set_drvdata(&chip->dev, priv);
        chip->acpi_dev_handle = device->handle;
        chip->flags = TPM_CHIP_FLAG_TPM2;
 
-       return tpm_chip_register(chip);
+       rc = tpm_chip_register(chip);
+
+out:
+       acpi_put_table((struct acpi_table_header *)buf);
+       return rc;
 }
 
 static int crb_acpi_remove(struct acpi_device *device)