[PATCH] Check curve_name for null to avoid crash

[Bob Wolff]

Hey all,
I think I addressed the nit of the missing blank line in my last email on
this thread. Wondering if there's more action to be had on my part or if
this just gets accepted etc.

Thanks!
Bob Wolff

On Tue, Feb 27, 2024 at 3:57 PM Bob Wolff <bob.wolff68 at gmail.com> wrote:

> If mixed rsa and ecdsa keys are specified in dtsi, an rsa key can be sent
> into the ecdsa verify. Without the ecdsa,curve property, this function will
> crash due to lack of checking the null pointer return.
>
> Signed-off-by: Bob Wolff <bob.wolff68 at gmail.com>
> ---
>
>  lib/ecdsa/ecdsa-verify.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/lib/ecdsa/ecdsa-verify.c b/lib/ecdsa/ecdsa-verify.c
> index 0601700c4f..4d1835b598 100644
> --- a/lib/ecdsa/ecdsa-verify.c
> +++ b/lib/ecdsa/ecdsa-verify.c
> @@ -31,6 +31,11 @@ static int fdt_get_key(struct ecdsa_public_key *key,
> const void *fdt, int node)
>         int x_len, y_len;
>
>         key->curve_name = fdt_getprop(fdt, node, "ecdsa,curve", NULL);
> +       if (!key->curve_name) {
> +               debug("Error: ecdsa cannot get 'ecdsa,curve' property from
> key. Likely not an ecdsa key.\n");
> +               return -ENOMSG;
> +       }
> +
>         key->size_bits = ecdsa_key_size(key->curve_name);
>         if (key->size_bits == 0) {
>                 debug("Unknown ECDSA curve '%s'", key->curve_name);
> --
> 2.39.3 (Apple Git-145)
>
>