[PATCHv2] fix endless loop in PTKCALCNEGOTIATING (was: Endless loop in hostapd trunk SHA implementation)
michael-dev at fami-braun.de
Fri Jul 6 19:20:23 EDT 2012
Am 06.06.2012 14:10, schrieb Jouni Malinen:
> On Tue, May 29, 2012 at 11:09:53PM +0200, michael-dev wrote:
>> I'm using OpenWRT trunk on a P1020WLAN (MPC85xx) SMP PPC32 system,
>> which uses the 2012-04-28 snapshot of hostapd with some patches .
>> Sometimes, the hostapd hangs in an infinite loop and all backtraces
>> got look similar (sometimes it is in SHA1Final)
> Do you have any particular reason to believe that the loop is indeed
> within the SHA-1 implementation? I would find it more likely that
> layer operations using SHA-1 are being executed in a loop.
you're right, it is not. This is actually an infinite loop in
PTKCALCNEGOTIATING, which does not terminate, as get_psk does never
This is due to the patch for wpa-psk radius support, which changes
hostapd_wpa_auth_get_psk to return always return the radius supplied psk
(if set) and ignores the prev_psk parameter for iteration. Attached
comes a patch that fixes this by virtually appending the radius supplied
psk to the list iterated by hostapd_get_psk and thus returning NULL when
prev_psk == sta->psk (radius).
Signed-hostap: M. Braun <michael-dev at fami-braun.de>
v2: this is the version that actually works (by fixing a typo)
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