Re: [PATCH v2] char: tpm: Fix possible memory leak in tpm_bios_measurements_open()

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On Thu, 2024-06-27 at 15:31 +0900, Joe Hattori wrote:
> In tpm_bios_measurements_open(), get_device() is called on the device
> embedded in struct tpm_chip. In the error path, however, put_device() is
> not called. This results in a reference count leak, which prevents the
> device from being properly released. This commit makes sure to call
> put_device() when the seq_open() call fails.
> 
> Fixes: 9b01b5356629 ("tpm: Move shared eventlog functions to common.c")
> Signed-off-by: Joe Hattori <joe@xxxxxxxxxxxxxxxxxxxxx>
> ---
> Changes since v1:
> - Keep the code diff minimal.
> - Fix the commit message.
> - Add a Fixes tag.
> ---
>  drivers/char/tpm/eventlog/common.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/char/tpm/eventlog/common.c b/drivers/char/tpm/eventlog/common.c
> index 639c3f395a5a..4c0bbba64ee5 100644
> --- a/drivers/char/tpm/eventlog/common.c
> +++ b/drivers/char/tpm/eventlog/common.c
> @@ -47,6 +47,8 @@ static int tpm_bios_measurements_open(struct inode *inode,
>  	if (!err) {
>  		seq = file->private_data;
>  		seq->private = chip;
> +	} else {
> +		put_device(&chip->dev);
>  	}
>  
>  	return err;

Thank you. I applied this.

BR, Jarkko





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