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In monitor mode, lbs_hard_start_xmit() casts skb->data to a radiotap TX header, skips that header, and then copies the 802.11 destination address from offset 4 in the remaining frame. The generic length check only rejects zero-length and oversized skbs, so a short monitor frame can be read past the end of the skb data. Require enough bytes for the radiotap TX header and the destination address field before using the monitor-mode header layout. Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn> Link: https://patch.msgid.link/20260704011140.37639-1-pengpeng@iscas.ac.cn Signed-off-by: Johannes Berg <johannes.berg@intel.com>