Re: [PATCH] HID: intel_ish-hid: tx_buf memory leak on probe/remove

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

On Tue, 2018-07-24 at 17:34 +0300, Anton Vasilyev wrote:
> ish_dev_init() allocates 512*176 bytes memory for tx_buf and stores
> it at
> &dev->wr_free_list_head.link list on ish_probe().
> But there is no deallocation of this memory in ish_remove() and in
> ish_probe() error path.
> So current intel-ish-ipc provides 88 KB memory leak for each
> probe/release.
> 
> The patch replaces kzalloc allocation by devm_kzalloc and removes
> ishtp_device *dev deallocation by kfree.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
I prefer align with "(" for the next line for multi line statements
even if character /line > slightly over 80. If you can do that resubmit
 with my ACK below.

> Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

> ---
>  drivers/hid/intel-ish-hid/ipc/ipc.c     | 7 +++++--
>  drivers/hid/intel-ish-hid/ipc/pci-ish.c | 2 --
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hid/intel-ish-hid/ipc/ipc.c b/drivers/hid/intel-
> ish-hid/ipc/ipc.c
> index 9a60ec13cb10..2f8e5402b450 100644
> --- a/drivers/hid/intel-ish-hid/ipc/ipc.c
> +++ b/drivers/hid/intel-ish-hid/ipc/ipc.c
> @@ -907,7 +907,8 @@ struct ishtp_device *ish_dev_init(struct pci_dev
> *pdev)
>  	struct ishtp_device *dev;
>  	int	i;
>  
> -	dev = kzalloc(sizeof(struct ishtp_device) + sizeof(struct
> ish_hw),
> +	dev = devm_kzalloc(&pdev->dev,
> +		sizeof(struct ishtp_device) + sizeof(struct ish_hw),
>  		GFP_KERNEL);
>  	if (!dev)
>  		return NULL;
> @@ -925,7 +926,9 @@ struct ishtp_device *ish_dev_init(struct pci_dev
> *pdev)
>  	for (i = 0; i < IPC_TX_FIFO_SIZE; ++i) {
>  		struct wr_msg_ctl_info	*tx_buf;
>  
> -		tx_buf = kzalloc(sizeof(struct wr_msg_ctl_info),
> GFP_KERNEL);
> +		tx_buf = devm_kzalloc(&pdev->dev,
> +			sizeof(struct wr_msg_ctl_info),
> +			GFP_KERNEL);
>  		if (!tx_buf) {
>  			/*
>  			 * IPC buffers may be limited or not
> available
> diff --git a/drivers/hid/intel-ish-hid/ipc/pci-ish.c
> b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
> index a2c53ea3b5ed..81d035a480bc 100644
> --- a/drivers/hid/intel-ish-hid/ipc/pci-ish.c
> +++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
> @@ -172,7 +172,6 @@ static int ish_probe(struct pci_dev *pdev, const
> struct pci_device_id *ent)
>  	free_irq(pdev->irq, dev);
>  free_device:
>  	pci_iounmap(pdev, hw->mem_addr);
> -	kfree(dev);
>  release_regions:
>  	pci_release_regions(pdev);
>  disable_device:
> @@ -202,7 +201,6 @@ static void ish_remove(struct pci_dev *pdev)
>  	pci_release_regions(pdev);
>  	pci_clear_master(pdev);
>  	pci_disable_device(pdev);
> -	kfree(ishtp_dev);
>  }
>  
>  static struct device __maybe_unused *ish_resume_device;