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| author | Zhu Yi <yi.zhu@intel.com> | 2010-01-26 15:58:57 +0800 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-01-26 11:52:13 -0500 |
| commit | 3092ad054406f069991ca561adc74f2d9fbb6867 (patch) | |
| tree | 498446eccd918d1fb4655a70422210c0c4d63394 /net | |
| parent | aa8bc9ef18a2c5b2b97e1f36ee9604cf15743f96 (diff) | |
| download | kernel-common-3092ad054406f069991ca561adc74f2d9fbb6867.tar.gz kernel-common-3092ad054406f069991ca561adc74f2d9fbb6867.tar.bz2 kernel-common-3092ad054406f069991ca561adc74f2d9fbb6867.zip | |
mac80211: fix NULL pointer dereference when ftrace is enabled
I got below kernel oops when I try to bring down the network interface if
ftrace is enabled. The root cause is drv_ampdu_action() is passed with a
NULL ssn pointer in the BA session tear down case. We need to check and
avoid dereferencing it in trace entry assignment.
BUG: unable to handle kernel NULL pointer dereference
Modules linked in: at (null)
IP: [<f98fe02a>] ftrace_raw_event_drv_ampdu_action+0x10a/0x160 [mac80211]
*pde = 00000000
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[...]
Call Trace:
[<f98fdf20>] ? ftrace_raw_event_drv_ampdu_action+0x0/0x160 [mac80211]
[<f98dac4c>] ? __ieee80211_stop_rx_ba_session+0xfc/0x220 [mac80211]
[<f98d97fb>] ? ieee80211_sta_tear_down_BA_sessions+0x3b/0x50 [mac80211]
[<f98dc6f6>] ? ieee80211_set_disassoc+0xe6/0x230 [mac80211]
[<f98dc6ac>] ? ieee80211_set_disassoc+0x9c/0x230 [mac80211]
[<f98dcbb8>] ? ieee80211_mgd_deauth+0x158/0x170 [mac80211]
[<f98e4bdb>] ? ieee80211_deauth+0x1b/0x20 [mac80211]
[<f8987f49>] ? __cfg80211_mlme_deauth+0xe9/0x120 [cfg80211]
[<f898b870>] ? __cfg80211_disconnect+0x170/0x1d0 [cfg80211]
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@kernel.org
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/driver-trace.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h index ee94ea0c67e9..da8497ef7063 100644 --- a/net/mac80211/driver-trace.h +++ b/net/mac80211/driver-trace.h @@ -680,7 +680,7 @@ TRACE_EVENT(drv_ampdu_action, __entry->ret = ret; __entry->action = action; __entry->tid = tid; - __entry->ssn = *ssn; + __entry->ssn = ssn ? *ssn : 0; ), TP_printk( |