macsec: clear encryption keys from the stack after setting up offload
macsec_add_rxsa and macsec_add_txsa copy the key to an on-stack offloading context to pass it to the drivers, but leaves it there when it's done. Clear it with memzero_explicit as soon as it's not needed anymore. Fixes: 3cf3227a ("net: macsec: hardware offloading infrastructure") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Reviewed-by: Antoine Tenart <atenart@kernel.org> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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