Re: [PATCH v2] tpm: acpi: Fix memory leak at tpm_read_log_acpi() error path

[Jarkko Sakkinen <jarkko@kernel.org>]

On Mon, Nov 09, 2026 at 06:37:52PM +0100, Takashi Iwai wrote:
> When devm_add_action() returns an error, tpm_read_log_acpi() clears
> log->bios_event_log unnecessarily to NULL before calling
> tpm_bios_log_free(), and it would lead to a memory leak of the
> allocated log buffer.
> 
> Fix it by simply jumping to the err.
> 
> Cc: <stable@vger.kernel.org>
> Fixes: a3a860bc0fd6 ("tpm: Change to kvalloc() in eventlog/acpi.c")
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> ---
> v1->v2: minor update of patch description and tags order
> 
>  drivers/char/tpm/eventlog/acpi.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
> index cf02ec646f46..50770cafa835 100644
> --- a/drivers/char/tpm/eventlog/acpi.c
> +++ b/drivers/char/tpm/eventlog/acpi.c
> @@ -167,10 +167,8 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
>  	}
>  
>  	ret = devm_add_action(&chip->dev, tpm_bios_log_free, log->bios_event_log);
> -	if (ret) {
> -		log->bios_event_log = NULL;
> +	if (ret)
>  		goto err;
> -	}
>  
>  	return format;
>  
> -- 
> 2.53.0
> 

Thank you!


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

Br, Jarkko