ath9k: Protect queue draining by rcu_read_lock()

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commit 182b191710 upstream.

When ath9k was switched over to use the mac80211 intermediate queues,
node cleanup now drains the mac80211 queues. However, this call path is
not protected by rcu_read_lock() as it was previously entirely internal
to the driver which uses its own locking.

This leads to a possible rcu_dereference() without holding
rcu_read_lock(); but only if a station is cleaned up while having
packets queued on the TXQ. Fix this by adding the rcu_read_lock() to the
caller in ath9k.

Fixes: 50f08edf98 ("ath9k: Switch to using mac80211 intermediate software queues.")
Cc: stable@vger.kernel.org
Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Toke Høiland-Jørgensen 2018-02-27 19:09:44 +02:00 • committed by Greg Kroah-Hartman

parent d8f2433802

commit a63b8d9a84

1 changed files with 4 additions and 0 deletions

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drivers/net/wireless/ath/ath9k/xmit.c

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