From: Johannes Berg <johannes@sipsolutions.net>
To: John Linville <linville@tuxdriver.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Subject: [PATCH] mac80211_hwsim: avoid NULL access
Date: Tue, 07 Jul 2009 03:43:02 +0200 [thread overview]
Message-ID: <1246930982.26030.0.camel@johannes.local> (raw)
There's a race condition -- started can be set to true
before channel is set due to the way mac80211 callbacks
currently work (->start should probably pass the channel
we would like to have initially). For now simply add a
check to hwsim to avoid dereferencing the NULL channel
pointer.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
drivers/net/wireless/mac80211_hwsim.c | 1 +
1 file changed, 1 insertion(+)
--- wireless-testing.orig/drivers/net/wireless/mac80211_hwsim.c 2009-07-07 03:29:38.000000000 +0200
+++ wireless-testing/drivers/net/wireless/mac80211_hwsim.c 2009-07-07 03:37:02.000000000 +0200
@@ -427,6 +427,7 @@ static bool mac80211_hwsim_tx_frame(stru
continue;
if (!data2->started || !hwsim_ps_rx_ok(data2, skb) ||
+ !data->channel || !data2->channel ||
data->channel->center_freq != data2->channel->center_freq ||
!(data->group & data2->group))
continue;
reply other threads:[~2009-07-07 1:42 UTC|newest]
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