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From: "Toke Høiland-Jørgensen" <toke@toke.dk>
To: Thomas Fourier <fourier.thomas@gmail.com>
Cc: Thomas Fourier <fourier.thomas@gmail.com>,
	stable@vger.kernel.org, Kalle Valo <kvalo@kernel.org>,
	Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
	"open list:QUALCOMM ATHEROS ATH9K WIRELESS DRIVER"
	<linux-wireless@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net] ath9k_htc: fix possibly missing barrier in ath9k_htc_rxep()
Date: Tue, 08 Sep 2026 10:00:53 +0200	[thread overview]
Message-ID: <871pb4goju.fsf@toke.dk> (raw)
In-Reply-To: <20260803104424.25880-1-fourier.thomas@gmail.com>

Thomas Fourier <fourier.thomas@gmail.com> writes:

> ath9k_rx_init() initialises the rx buffer and its lock then calls a
> memory barrier and then sets the priv->rx.initialized flag. However,
> ath9k_htc_rxep() reads that flag and imidiatly takes the lock. This may
> cause the lock to be taken while not fully initialized.
>
> Add a barrier to prevent speculative read of the lock before checking
> the initized flag.
>
> Fixes: b0ec7e55fce6 ("ath9k_htc: fix NULL pointer dereference at ath9k_htc_rxep()")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>

Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>

  reply	other threads:[~2026-09-08  8:01 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-03 10:44 [PATCH net] ath9k_htc: fix possibly missing barrier in ath9k_htc_rxep() Thomas Fourier
2026-09-08  8:00 ` Toke Høiland-Jørgensen [this message]
2026-09-08 15:04 ` Jeff Johnson
2026-09-08 16:43   ` Toke Høiland-Jørgensen

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