Subject: Re: [PATCH v6 1/6] optee: ffa: Add NULL check in optee_ffa_lend_protmem

From: Sumit Garg <[email-masked]>
Date: Thu, 28 May 2026 00:25:56 +0530

On Wed, May 27, 2026 at 03:02:31PM +0000, Mostafa Saleh wrote:
> Sashiko (locally) reports a possible null dereference under memory
> pressure due to the lack of validation of the allocated pointer.
> 
> Fix that by adding the missing check.
> 
> Fixes: 2b78d79cdf96 ("optee: FF-A: dynamic protected memory allocation")
> Signed-off-by: Mostafa Saleh <[email-masked]>
> ---
>  drivers/tee/optee/ffa_abi.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Sumit Garg <[email-masked]>

-Sumit

> 
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index b4372fa268d0..633715b98625 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -698,6 +698,9 @@ static int optee_ffa_lend_protmem(struct optee *optee, struct tee_shm *protmem,
>  	int rc;
>  
>  	mem_attr = kzalloc_objs(*mem_attr, ma_count);
> +	if (!mem_attr)
> +		return -ENOMEM;
> +
>  	for (n = 0; n < ma_count; n++) {
>  		mem_attr[n].receiver = mem_attrs[n] & U16_MAX;
>  		mem_attr[n].attrs = mem_attrs[n] >> 16;
> -- 
> 2.54.0.746.g67dd491aae-goog
>