wifi: cfg80211: move A-MSDU check in ieee80211_data_to_8023_exthdr

When parsing the outer A-MSDU header, don't check for inner bridge tunnel
or RFC1042 headers. This is handled by ieee80211_amsdu_to_8023s already.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230213100855.34315-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/util.c

@@ -631,8 +631,9 @@ int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
 		break;
 	}
 
-	if (likely(skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)) == 0 &&
-	           ((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
+	if (likely(!is_amsdu &&
+		   skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)) == 0 &&
+	           ((ether_addr_equal(payload.hdr, rfc1042_header) &&
 		     payload.proto != htons(ETH_P_AARP) &&
 		     payload.proto != htons(ETH_P_IPX)) ||
 		    ether_addr_equal(payload.hdr, bridge_tunnel_header)))) {