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tpm: fix invalid locking in NONBLOCKING mode
When an application sends TPM commands in NONBLOCKING mode
the driver holds chip->tpm_mutex returning from write(),
which triggers: "WARNING: lock held when returning to user space".
To fix this issue the driver needs to release the mutex before
returning and acquire it again in tpm_dev_async_work() before
sending the command.
Cc: stable@vger.kernel.org
Fixes: 9e1b74a63f
(tpm: add support for nonblocking operation)
Reported-by: Jeffrin Jose T <jeffrin@rajagiritech.edu.in>
Tested-by: Jeffrin Jose T <jeffrin@rajagiritech.edu.in>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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parent
45477b3fe3
commit
d23d124843
@ -61,6 +61,12 @@ static void tpm_dev_async_work(struct work_struct *work)
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mutex_lock(&priv->buffer_mutex);
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priv->command_enqueued = false;
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ret = tpm_try_get_ops(priv->chip);
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if (ret) {
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priv->response_length = ret;
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goto out;
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}
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ret = tpm_dev_transmit(priv->chip, priv->space, priv->data_buffer,
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sizeof(priv->data_buffer));
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tpm_put_ops(priv->chip);
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@ -68,6 +74,7 @@ static void tpm_dev_async_work(struct work_struct *work)
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priv->response_length = ret;
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mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
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}
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out:
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mutex_unlock(&priv->buffer_mutex);
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wake_up_interruptible(&priv->async_wait);
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}
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@ -204,6 +211,7 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf,
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if (file->f_flags & O_NONBLOCK) {
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priv->command_enqueued = true;
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queue_work(tpm_dev_wq, &priv->async_work);
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tpm_put_ops(priv->chip);
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mutex_unlock(&priv->buffer_mutex);
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return size;
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}
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