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When the BSS table is being updated based on new scan results, a BSS entry could end up getting added into last_scan_res list multiple times if the scan results from the driver includes duplicated values. This should not happen with driver_nl80211.c since it filter outs duplicates, but in theory, other driver wrappers could indicate such scan results. Anyway, it is safer to make sure this cannot happen by explicitly verifying the last_scan_res list before adding an updated BSS entry there. A duplicated entry in the list could potentially result in freed memory being used if there is large enough number of BSSes in the scan results to cause removal of old BSS entries. Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
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