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Re: [PATCH] cfg80211: fix BSS list hidden SSID lookup

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On Fri, 2013-02-01 at 19:23 +0100, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg@xxxxxxxxx>
> 
> When trying to find a hidden SSID, the lookup function
> is done wrong; the code is trying to combine the two
> lookups into one, and as a consequence doesn't always
> find the entry at all. To understand this, consider a
> case where multiple BSS entries with the same channel
> and BSSID exist but have different SSID length. Then
> comparing against the probe response SSID length is
> bound to cause problems since the hidden one might be
> either zeroed out or zero-length.

Note that the bug really only matters if you have multiple hidden SSIDs
on a single BSSID, and those have different lengths. Which I think is
possible with some Cisco deployments ...

johannes

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