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Date: Tue, 7 Jun 2022 18:54:09 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Brian Norris <briannorris@...omium.org>, Niels Dossche <dossche.niels@...il.com>, Kalle Valo <kvalo@...nel.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.17 057/772] mwifiex: add mutex lock for call in mwifiex_dfs_chan_sw_work_queue From: Niels Dossche <dossche.niels@...il.com> [ Upstream commit 3e12968f6d12a34b540c39cbd696a760cc4616f0 ] cfg80211_ch_switch_notify uses ASSERT_WDEV_LOCK to assert that net_device->ieee80211_ptr->mtx (which is the same as priv->wdev.mtx) is held during the function's execution. mwifiex_dfs_chan_sw_work_queue is one of its callers, which does not hold that lock, therefore violating the assertion. Add a lock around the call. Disclaimer: I am currently working on a static analyser to detect missing locks. This was a reported case. I manually verified the report by looking at the code, so that I do not send wrong information or patches. After concluding that this seems to be a true positive, I created this patch. However, as I do not in fact have this particular hardware, I was unable to test it. Reviewed-by: Brian Norris <briannorris@...omium.org> Signed-off-by: Niels Dossche <dossche.niels@...il.com> Signed-off-by: Kalle Valo <kvalo@...nel.org> Link: https://lore.kernel.org/r/20220321225515.32113-1-dossche.niels@gmail.com Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/net/wireless/marvell/mwifiex/11h.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/11h.c b/drivers/net/wireless/marvell/mwifiex/11h.c index d2ee6469e67b..3fa25cd64cda 100644 --- a/drivers/net/wireless/marvell/mwifiex/11h.c +++ b/drivers/net/wireless/marvell/mwifiex/11h.c @@ -303,5 +303,7 @@ void mwifiex_dfs_chan_sw_work_queue(struct work_struct *work) mwifiex_dbg(priv->adapter, MSG, "indicating channel switch completion to kernel\n"); + mutex_lock(&priv->wdev.mtx); cfg80211_ch_switch_notify(priv->netdev, &priv->dfs_chandef); + mutex_unlock(&priv->wdev.mtx); } -- 2.35.1
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