From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 855BB37F8DB for ; Mon, 3 Aug 2026 10:44:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753876; cv=none; b=u8ZbEhQjihfa+UWHtrfiTHK738ekylLwngq6QfJCp4knBrRCiM4rn6Hw3hD3ZgBx6MaeFy9/K5L9EP+LctT74SZyfd06XLYr3C+nt4BuNSIrULqFthDsSnC9Mm1Yt99WSc1JpdgGzj/kxsCRWGbpxoSihgXG+Rv8Xo5onyr/XYY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785753876; c=relaxed/simple; bh=tMpC1xzdo63lqopHFPlw01oLOuykRATWAu2nX08wIec=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qr/+2SO7Gbcl/38SUi/JShylmIOfgWNdDLqcknVBQO0IlKBEHdl//8SZ1cs9KY9a8t59Px6qhVuXEe0gIHnjlZa8B4TzSYWb4zJLLlsnp792MJiRi2DsxCodo8dr08wmzjjpeM6SsYC5UVtjMBWFzFQb25AEKzlyKHsAfYdg/Sw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=f0pZr/Ey; arc=none smtp.client-ip=209.85.221.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="f0pZr/Ey" Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-47f611b3af9so450863f8f.3 for ; Mon, 03 Aug 2026 03:44:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785753873; x=1786358673; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=Fe47mFnGJrnj7q96fsdIDjsBMpDbZQXw/JGM6RT1ooQ=; b=f0pZr/Ey3JhQIvvRc3kq+T+IZnZkjDMWwHayn1NA5CcFslDkyEBcC1SAX/jW8Rbsw4 iAXW4hyxhC9d6tLRIaGCFy/7kWhKZtinAOC5t5eY2ZhrH1SdK+86yxjq0VPcqbs+apeL usn5yfbROiiTiQz3xp5nFcb54wBW/ndRkxxTVYsuEkm5oY4QcqWWMTsuTlKv3LgTIe19 GwH0HZl3n7D93iYiCsTD2ptoZZR9+/mxejKXFDQYjWryAq/F3cdcn3DwC94AmFkd7LQR 1VP57f9Otq6SkvP6mlSTx7x8yfHnZ0TiaMhCutTfr9tlOE43DKtGSojgnWGb40+KyKSF 66NQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785753873; x=1786358673; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Fe47mFnGJrnj7q96fsdIDjsBMpDbZQXw/JGM6RT1ooQ=; b=kVIyrc4HnkgHEeMvqeM195w0uDBJIeZXva8TBlHHcEZPaGQLnezufO01WMpJY1p9qP TbRu/vCHfrYU0SDyo4GstT8iqx8OjKQ0ObCPpyRIYh3ice6zH34v5rsUWk6VmvmpN51o YjtCAtjw99s8wPkJXKmntFdwduduyWdCK62UxZI4C9L6hUgKDGr/vwRhUE3gp6An9mVY ee1QDGdyzHad1bWdP59quBAqfO2+a/s/BSld2PbIAPhESXjsARQlxWItPYA/73EmDYs8 WOLhQP6DDyQLzBN/cSo493A0hbjs8VtROE+/szOiOeahRGsaoTg0n82LvMyLmmUCkIz+ Trrg== X-Forwarded-Encrypted: i=1; AHgh+Rp99G22rKbq6jGjUQR6/Z2M8EGG39annSpv/w7lYE7SY6GIswpNXbeqJSQpXq8VP582gFhytIzXzrAiLo4=@vger.kernel.org X-Gm-Message-State: AOJu0Yyaa4T36VU0/8YCniukHw8uK3K8a/ZLpHsVcvFDJrnPoWfCsg97 /KZiZomccVWbuaVj1uevV9FLJL2z9sV6zZfBenYr6xiRQmOYYRuqxuLp X-Gm-Gg: AR+sD13AvqLlGXuWkuT+3shTU7Jg01WVqyoejQmfdNXQJnuRFJG6yOG+qNPSjG4n7GH fSCVo0vQtwCURzZs27mlrRCC0E9gKtyECl652hshjbxe8zJQrga/5e9fKHKeGD7VyhfcyxH6vix gXOvPS3cBlhEsm0KsKeTXxMuq30NP+QDA4enn1WZrK55jKx7HESw4AOiq6In7Gs3iRVE0Y8gAVD ebju8ogjlTm3sreCK766hlksngaAiIcBVqE3hCaaZ+I+gWmO+MVbAaI8JefOIjWGYoK6ScnzIxH 3Zdw1XCGyH590pY5Ey5UN/4QtwPxT0F924nFexGV3bstsrvwVkIY2XfOzTycz5BikSeYt2ZMKj7 U/KyV8MIhyVsEne9Hicd4/GZF2RZsSSzGbW38HaV1HvxwpChefLL++423bj2T71ZNe2/nK/6nHT F3mYRG7ghVgT52bAbDFVBCBUy1U+gvbJhzS6yM/HJGlgWQpjhiU1HkU8xOqPkAX23LKWuZ0l3Vp Blg4OGvn5kzkgxsPdEjWRA= X-Received: by 2002:a05:600c:4687:b0:495:650b:4c61 with SMTP id 5b1f17b1804b1-4980c68e3f1mr104460385e9.3.1785753872457; Mon, 03 Aug 2026 03:44:32 -0700 (PDT) Received: from thomas-precision3591.. ([2a04:cec0:101e:c128:347c:a6c3:e6c1:747]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-49807b5f0c3sm199352955e9.5.2026.08.03.03.44.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 03:44:32 -0700 (PDT) From: Thomas Fourier To: Cc: Thomas Fourier , stable@vger.kernel.org, =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Kalle Valo , Tetsuo Handa , linux-wireless@vger.kernel.org (open list:QUALCOMM ATHEROS ATH9K WIRELESS DRIVER), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net] ath9k_htc: fix possibly missing barrier in ath9k_htc_rxep() Date: Mon, 3 Aug 2026 12:44:22 +0200 Message-ID: <20260803104424.25880-1-fourier.thomas@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: Signed-off-by: Thomas Fourier --- drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c index bed7ea2425a0..97d61f3f0aad 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c @@ -1145,6 +1145,12 @@ void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb, if (!data_race(priv->rx.initialized)) goto err; + /* + * Make sure all the ath9k_rx_init() memory writes are visible before + * proceeding. + */ + smp_rmb(); + spin_lock_irqsave(&priv->rx.rxbuflock, flags); list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) { if (!tmp_buf->in_process) { -- 2.43.0