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Re: [PATCH] cfg80211: Fix support for flushing old scan results

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Hi Johannes,

On 05/22/2018 03:12 AM, Johannes Berg wrote:
Hi Denis,

Just FYI, there's definitely something funny with the scanning code:

denkenz@iwd-test ~ $ sudo iw dev wlp2s0 scan flush
BSS 10:c3:7b:54:74:d4(on wlp2s0)
	last seen: 274.815s [boottime]
	freq: 5765
	beacon interval: 100 TUs
	signal: -35.00 dBm
	last seen: 349 ms ago
	Information elements from Probe Response frame:
	SSID: \x00\x00\x00\x00\x00\x00\x00\x00\x00

This is already rather strange to start with. Can you provide a sniffer
capture of this situation?

Will do


Thing is - the all-zero-bytes there points to using hidden SSID with a
length of 9 characters, BUT
  * "myssid" is just 6 characters long - or did you edit that?

Good eyes!  Yes this was edited to protect the innocent neighbors ;)

  * normally the zeroed-out SSID isn't transmitted in a *probe response*
    but only in beacons

Exactly.  That's what makes this really weird.

Regards,
-Denis



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