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Pre-authentication frames (ETH_P_PREAUTH, 0x88C7) are sent before the authentication handshake completes with the target AP, so no encryption key exists for them yet. Unlike normal EAPOL frames (ETH_P_8021X, 0x888E) which are registered as the control port protocol, pre-auth frames are not recognized as control port frames, causing the kernel to incorrectly assign the current AP's key and attempt encryption, resulting in a WARN_ON in ieee80211_encrypt_tx_skb when the cipher is not handled. Fix this by setting IEEE80211_TX_INTFL_DONT_ENCRYPT for pre-auth frames in ieee80211_tx_h_check_control_port_protocol(), so that key selection skips them and they are sent unencrypted as intended. Note that the only driver hitting this path is hwsim. Reported-by: syzbot+b6ce23950fd636e6efb6@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=b6ce23950fd636e6efb6 Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com> Link: https://patch.msgid.link/20260713015946.44636-1-kartikey406@gmail.com [add note about hwsim, fix subject] Signed-off-by: Johannes Berg <johannes.berg@intel.com>