Re: [PATCH 5.3] rt2x00: clear up IV's on key removal

[Emil Karlson <jekarl@iki.fi>]

On Fri, 23 Aug 2019 14:48:03 +0200
Stanislaw Gruszka <sgruszka@redhat.com> wrote:

> After looking at code I realized that my previous fix
> 95844124385e ("rt2x00: clear IV's on start to fix AP mode regression")
> was incomplete. We can still have wrong IV's after re-keyring.
> To fix that, clear up IV's also on key removal.
> 
> Fixes: 710e6cc1595e ("rt2800: do not nullify initialization vector
> data") Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
> ---
>  drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 19
> ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
> b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c index
> ecbe78b8027b..28e2de04834e 100644 ---
> a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +++
> b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c @@ -1654,13 +1654,18
> @@ static void rt2800_config_wcid_attr_cipher(struct rt2x00_dev
> *rt2x00dev, offset = MAC_IVEIV_ENTRY(key->hw_key_idx);
>  
> -	rt2800_register_multiread(rt2x00dev, offset,
> -				  &iveiv_entry, sizeof(iveiv_entry));
> -	if ((crypto->cipher == CIPHER_TKIP) ||
> -	    (crypto->cipher == CIPHER_TKIP_NO_MIC) ||
> -	    (crypto->cipher == CIPHER_AES))
> -		iveiv_entry.iv[3] |= 0x20;
> -	iveiv_entry.iv[3] |= key->keyidx << 6;
> +	if (crypto->cmd == SET_KEY) {
> +		rt2800_register_multiread(rt2x00dev, offset,
> +					  &iveiv_entry,
> sizeof(iveiv_entry));
> +		if ((crypto->cipher == CIPHER_TKIP) ||
> +		    (crypto->cipher == CIPHER_TKIP_NO_MIC) ||
> +		    (crypto->cipher == CIPHER_AES))
> +			iveiv_entry.iv[3] |= 0x20;
> +		iveiv_entry.iv[3] |= key->keyidx << 6;
> +	} else {
> +		memset(&iveiv_entry, 0, sizeof(iveiv_entry));
> +	}
> +
>  	rt2800_register_multiwrite(rt2x00dev, offset,
>  				   &iveiv_entry,
> sizeof(iveiv_entry)); }

Seems to work when used with the previous patch on top of 5.3-rc6
tested-by: Emil Karlson <jekarl@iki.fi>