linux-kernel - BUG: 4.10 rtlwifi regression

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Message-ID: <20170109014150.GD4623@shells.gnugeneration.com>
Date:   Sun, 8 Jan 2017 19:41:50 -0600
From:   lkml@...garu.com
To:     linux-kernel@...r.kernel.org
Cc:     Larry.Finger@...inger.net, pkshih@...ltek.com
Subject: BUG: 4.10 rtlwifi regression - NULL pointer dereference

Hello list,

Gave 4.10-rc2 a shot today using the attached config.  The kernel panics
with a NULL pointer dereference upon starting dhclient after
wpa_supplicant.

The network device is a USB dongle:
Bus 002 Device 002: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]

Reverting 'ba9f93f rtlwifi: Fix enter/exit power_save' prevents the
crash.

Sorry I don't have a verbatim capture of the panic, but I was able to
catch the relevant parts and rtl_lps_leave() is dereferencing a NULL hw,
below setup_arp_tx() and rtl_is_special_data().  That's what led me to
reverting ba9f93f since it clearly plays with that stuff.

FWIW machine is a plain X61s thinkpad, 1.8Ghz.

Regards,
Vito Caputo

View attachment "4.10-rc2.config" of type "text/plain" (104229 bytes)