[PATCH] crypto: atmel-ecc - reject hardware ECDH without a public key

[Herbert Xu]

On Thu, Jun 11, 2026 at 11:36:17PM +0200, Thorsten Blum wrote:
> The hardware ECDH path in atmel_ecdh_compute_shared_secret() uses the
> private key stored in the device. However, the public key is cached only
> after atmel_ecdh_set_secret() successfully generated that private key
> for the current tfm.
> 
> atmel_ecdh_generate_public_key() already rejects requests when no public
> key is cached. Add the same check to atmel_ecdh_compute_shared_secret()
> to prevent the device from using a private key that was not generated
> for the current tfm.
> 
> Fixes: 11105693fa05 ("crypto: atmel-ecc - introduce Microchip / Atmel ECC driver")
> Signed-off-by: Thorsten Blum <thorsten.blum at linux.dev>
> ---
>  drivers/crypto/atmel-ecc.c | 3 +++
>  1 file changed, 3 insertions(+)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt