Return-path: Received: from ey-out-2122.google.com ([74.125.78.27]:43947 "EHLO ey-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757424AbZDATSU convert rfc822-to-8bit (ORCPT ); Wed, 1 Apr 2009 15:18:20 -0400 Received: by ey-out-2122.google.com with SMTP id 4so53237eyf.37 for ; Wed, 01 Apr 2009 12:18:16 -0700 (PDT) From: Ivo van Doorn To: stable@kernel.org Subject: [PATCH] rt2x00: Fix SLAB corruption during rmmod Date: Wed, 1 Apr 2009 21:18:11 +0200 Cc: Arnaud Patard , Gertjan van Wingerde , "linux-wireless" , "John W. Linville" MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Message-Id: <200904012118.12391.IvDoorn@gmail.com> (sfid-20090401_211825_416755_7CD63706) Sender: linux-wireless-owner@vger.kernel.org List-ID: At rmmod stage, the code path is the following one : rt2x00lib_remove_dev =C2=A0 -> =C2=A0rt2x00lib_uninitialize() =C2=A0 =C2=A0 =C2=A0 =C2=A0 -> rt2x00rfkill_unregister() =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-> rfkill_unregister() =C2=A0 =C2=A0 =C2=A0 =C2=A0 -> rt2x00rfkill_free() =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-> rfkill_free() The problem is that rfkill_free should not be called after rfkill_regis= ter otherwise put_device(&rfkill->dev) will be called 2 times. This patch fixes this by only calling rt2x00rfkill_free() when rt2x00rfkill_regist= er() hasn't been called or has failed. Signed-off-by: Gertjan van Wingerde Tested-by: Arnaud Patard Signed-off-by: Ivo van Doorn --- This patch is for 2.6.29 only. The code in question has completely disa= ppeared in 2.6.30 and does not contain this bug. --- diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireles= s/rt2x00/rt2x00.h index 39ecf3b..820fdb2 100644 --- a/drivers/net/wireless/rt2x00/rt2x00.h +++ b/drivers/net/wireless/rt2x00/rt2x00.h @@ -687,8 +687,7 @@ struct rt2x00_dev { */ #ifdef CONFIG_RT2X00_LIB_RFKILL unsigned long rfkill_state; -#define RFKILL_STATE_ALLOCATED 1 -#define RFKILL_STATE_REGISTERED 2 +#define RFKILL_STATE_REGISTERED 1 struct rfkill *rfkill; struct delayed_work rfkill_work; #endif /* CONFIG_RT2X00_LIB_RFKILL */ diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wire= less/rt2x00/rt2x00dev.c index 87c0f2c..e694bb7 100644 --- a/drivers/net/wireless/rt2x00/rt2x00dev.c +++ b/drivers/net/wireless/rt2x00/rt2x00dev.c @@ -1105,7 +1105,6 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00= dev) * Register extra components. */ rt2x00leds_register(rt2x00dev); - rt2x00rfkill_allocate(rt2x00dev); rt2x00debug_register(rt2x00dev); =20 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags); @@ -1137,7 +1136,6 @@ void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x= 00dev) * Free extra components */ rt2x00debug_deregister(rt2x00dev); - rt2x00rfkill_free(rt2x00dev); rt2x00leds_unregister(rt2x00dev); =20 /* diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wire= less/rt2x00/rt2x00lib.h index 86cd26f..49309d4 100644 --- a/drivers/net/wireless/rt2x00/rt2x00lib.h +++ b/drivers/net/wireless/rt2x00/rt2x00lib.h @@ -260,8 +260,6 @@ static inline void rt2x00crypto_rx_insert_iv(struct= sk_buff *skb, #ifdef CONFIG_RT2X00_LIB_RFKILL void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev); void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev); -void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev); -void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev); #else static inline void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev) { @@ -270,14 +268,6 @@ static inline void rt2x00rfkill_register(struct rt= 2x00_dev *rt2x00dev) static inline void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00de= v) { } - -static inline void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev) -{ -} - -static inline void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev) -{ -} #endif /* CONFIG_RT2X00_LIB_RFKILL */ =20 /* diff --git a/drivers/net/wireless/rt2x00/rt2x00rfkill.c b/drivers/net/w= ireless/rt2x00/rt2x00rfkill.c index 3298cae..08ffc6d 100644 --- a/drivers/net/wireless/rt2x00/rt2x00rfkill.c +++ b/drivers/net/wireless/rt2x00/rt2x00rfkill.c @@ -94,14 +94,50 @@ static void rt2x00rfkill_poll(struct work_struct *w= ork) &rt2x00dev->rfkill_work, RFKILL_POLL_INTERVAL); } =20 +static int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev) +{ + struct device *dev =3D wiphy_dev(rt2x00dev->hw->wiphy); + + rt2x00dev->rfkill =3D rfkill_allocate(dev, RFKILL_TYPE_WLAN); + if (!rt2x00dev->rfkill) + return -ENOMEM; + + rt2x00dev->rfkill->name =3D rt2x00dev->ops->name; + rt2x00dev->rfkill->data =3D rt2x00dev; + rt2x00dev->rfkill->toggle_radio =3D rt2x00rfkill_toggle_radio; + if (test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags)) { + rt2x00dev->rfkill->get_state =3D rt2x00rfkill_get_state; + rt2x00dev->rfkill->state =3D + rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ? + RFKILL_STATE_SOFT_BLOCKED : RFKILL_STATE_UNBLOCKED; + } else { + rt2x00dev->rfkill->state =3D RFKILL_STATE_UNBLOCKED; + } + + INIT_DELAYED_WORK(&rt2x00dev->rfkill_work, rt2x00rfkill_poll); + + return 0; +} + +static void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev) +{ + rfkill_free(rt2x00dev->rfkill); + rt2x00dev->rfkill =3D NULL; +} + void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev) { - if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) || - test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state)) + if (test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state)) + return; + + if (rt2x00rfkill_allocate(rt2x00dev)) { + ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n"); return; + } =20 if (rfkill_register(rt2x00dev->rfkill)) { ERROR(rt2x00dev, "Failed to register rfkill handler.\n"); + rt2x00rfkill_free(rt2x00dev); return; } =20 @@ -117,8 +153,7 @@ void rt2x00rfkill_register(struct rt2x00_dev *rt2x0= 0dev) =20 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev) { - if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) || - !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state)) + if (!test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state)) return; =20 cancel_delayed_work_sync(&rt2x00dev->rfkill_work); @@ -127,46 +162,3 @@ void rt2x00rfkill_unregister(struct rt2x00_dev *rt= 2x00dev) =20 __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state); } - -void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev) -{ - struct device *dev =3D wiphy_dev(rt2x00dev->hw->wiphy); - - if (test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state)) - return; - - rt2x00dev->rfkill =3D rfkill_allocate(dev, RFKILL_TYPE_WLAN); - if (!rt2x00dev->rfkill) { - ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n"); - return; - } - - __set_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state); - - rt2x00dev->rfkill->name =3D rt2x00dev->ops->name; - rt2x00dev->rfkill->data =3D rt2x00dev; - rt2x00dev->rfkill->toggle_radio =3D rt2x00rfkill_toggle_radio; - if (test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags)) { - rt2x00dev->rfkill->get_state =3D rt2x00rfkill_get_state; - rt2x00dev->rfkill->state =3D - rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ? - RFKILL_STATE_SOFT_BLOCKED : RFKILL_STATE_UNBLOCKED; - } else { - rt2x00dev->rfkill->state =3D RFKILL_STATE_UNBLOCKED; - } - - INIT_DELAYED_WORK(&rt2x00dev->rfkill_work, rt2x00rfkill_poll); - - return; -} - -void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev) -{ - if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state)) - return; - - cancel_delayed_work_sync(&rt2x00dev->rfkill_work); - - rfkill_free(rt2x00dev->rfkill); - rt2x00dev->rfkill =3D NULL; -} -- To unsubscribe from this list: send the line "unsubscribe linux-wireles= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html