linux-kernel - Re: [PATCH] tee: fix memory leak in tee_dyn_shm_alloc

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Message-ID: <aIiUEGt2uVF9yi1W@sumit-X1>
Date: Tue, 29 Jul 2025 14:57:44 +0530
From: Sumit Garg <sumit.garg@...nel.org>
To: Pei Xiao <xiaopei01@...inos.cn>
Cc: jens.wiklander@...aro.org, balint.dobszay@....com,
	op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tee: fix memory leak in tee_dyn_shm_alloc_helper

On Wed, Jul 23, 2025 at 02:22:41PM +0800, Pei Xiao wrote:
> When shm_register() fails in tee_dyn_shm_alloc_helper(), the pre-allocated
> pages array is not freed, resulting in a memory leak.
> 
> Fixes: cf4441503e20 ("tee: optee: Move pool_op helper functions")
> Signed-off-by: Pei Xiao <xiaopei01@...inos.cn>
> ---
>  drivers/tee/tee_shm.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)

Reviewed-by: Sumit Garg <sumit.garg@....qualcomm.com>

-Sumit

> 
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index 915239b033f5..2a7d253d9c55 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -230,7 +230,7 @@ int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align,
>  	pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
>  	if (!pages) {
>  		rc = -ENOMEM;
> -		goto err;
> +		goto err_pages;
>  	}
>  
>  	for (i = 0; i < nr_pages; i++)
> @@ -243,11 +243,13 @@ int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align,
>  		rc = shm_register(shm->ctx, shm, pages, nr_pages,
>  				  (unsigned long)shm->kaddr);
>  		if (rc)
> -			goto err;
> +			goto err_kfree;
>  	}
>  
>  	return 0;
> -err:
> +err_kfree:
> +	kfree(pages);
> +err_pages:
>  	free_pages_exact(shm->kaddr, shm->size);
>  	shm->kaddr = NULL;
>  	return rc;
> -- 
> 2.25.1
>