w1: Split memcpy() of struct cn_msg flexible array

To work around a misbehavior of the compiler's ability to see into
composite flexible array structs (as detailed in the coming memcpy()
hardening series[1]), split the memcpy() of the header and the payload
so no false positive run-time overflow warning will be generated.

[1] https://lore.kernel.org/linux-hardening/[email protected]/

Cc: Evgeniy Polyakov <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: kees

drivers/w1/w1_netlink.c

@@ -611,7 +611,8 @@ static void w1_cn_callback(struct cn_msg *cn, struct netlink_skb_parms *nsp)
 		}
 		atomic_set(&block->refcnt, 1);
 		block->portid = nsp->portid;
-		memcpy(&block->request_cn, cn, sizeof(*cn) + cn->len);
+		block->request_cn = *cn;
+		memcpy(block->request_cn.data, cn->data, cn->len);
 		node = (struct w1_cb_node *)(block->request_cn.data + cn->len);
 
 		/* Sneeky, when not bundling, reply_size is the allocated space