On 06/06/2015 08:20 AM, Kalle Valo wrote:
Severn <[email protected]> writes:

I've been hitting this NULL pointer deref with an rtl8188ee PCIE card.
It happens 100% of the time when I bring up a WPA2-PSK AP with hostapd
2.4.

If I revert 33511b157bbcebaef853cc1811992b664a2e5862, everything seems
to work properly.

Below is my hostapd.conf and the crash log. This is mainline 4.0.4
with no patches.

Below is the changelog for the commit. Larry & Taehee, what should we
do?

commit 33511b157bbcebaef853cc1811992b664a2e5862
Author: Taehee Yoo <[email protected]>
Date:   Wed Jan 21 16:58:19 2015 +0900

     rtlwifi: add support to send beacon frame.

     In AP mode, beacon frame is necessary to keep connection.
     this patch adds a sending beacon frame routine in initialization routine.

     Signed-off-by: Taehee Yoo <[email protected]>
     Acked-by: Larry Finger <[email protected]>
     Signed-off-by: Kalle Valo <[email protected]>

Kalle,

I'm trying to find the missing setup step when the new interface is added to the driver. Whatever it is is causing mac80211 to issue the warning at net/mac80211/driver-ops.h:12. That problem appears to cascade to the NULL pointer dereference. Any help would be appreciated.

Reversion of the above commit may be necessary, but I would like to see if we can get a better "fix" as that commit is necessary for proper beaconing.

Larry

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