Re: [PATCH next] crypto/ccp: sev-dev-tsm: fix use after free in sev_tsm_init_locked()

[Tom Lendacky]

On 12/5/25 05:39, Dan Carpenter wrote:
> This code frees "t" and then dereferences it on the next line to
> print the error code.  Re-order the code to avoid the use after
> free.
> 
> Fixes: 3532f6154971 ("crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

> ---
>  drivers/crypto/ccp/sev-dev-tsm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/ccp/sev-dev-tsm.c b/drivers/crypto/ccp/sev-dev-tsm.c
> index ea29cd5d0ff9..06e9f0bc153e 100644
> --- a/drivers/crypto/ccp/sev-dev-tsm.c
> +++ b/drivers/crypto/ccp/sev-dev-tsm.c
> @@ -391,9 +391,9 @@ void sev_tsm_init_locked(struct sev_device *sev, void *tio_status_page)
>  	return;
>  
>  error_exit:
> -	kfree(t);
>  	pr_err("Failed to enable SEV-TIO: ret=%d en=%d initdone=%d SEV=%d\n",
>  	       ret, t->tio_en, t->tio_init_done, boot_cpu_has(X86_FEATURE_SEV));
> +	kfree(t);
>  }
>  
>  void sev_tsm_uninit(struct sev_device *sev)