From nobody Sun Feb 8 17:04:24 2026 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (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 4E4092BD01 for ; Thu, 22 Feb 2024 08:53:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708592013; cv=none; b=peyP5Urxye8qcFJgJfmf6bm3oeOEa9EkiXJYnXhrSixqhBloEO3+5aBG9SRFIT5CrQNuDzNbBDeGLUD6sYuwjMolE/OvHK1Y00eJ4DO9/c59iEMBVZ9Kd7Lif+2h/8xoEWpMjqaKkgoafeei8mOnsLM11x/oRF3EwLoejpgwIS4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708592013; c=relaxed/simple; bh=ZaCt5bs1UxqZ+qs7mRxsARXzEk6hn2SLa2V4crMdhUM=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=AV5OMDojnRZvs57URwZeuoNghCMGyncOJ7ueBsKYyi2uQy+M2/z9U5GX0UMOpjBPAir5dQ309A0GwH8uMiTMUUCa55hvC3a6Iax0yCuPm68kj64gntXqj0a4BMuc4BlEKSdztUl78ygmCwms5TAA+eD68XW7S0eMWhYt2VqcVjU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=xDm6difF; arc=none smtp.client-ip=209.85.128.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="xDm6difF" Received: by mail-wm1-f45.google.com with SMTP id 5b1f17b1804b1-4128cfb6c1aso517135e9.0 for ; Thu, 22 Feb 2024 00:53:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1708592008; x=1709196808; darn=vger.kernel.org; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=w8UwvKUddBcDJ30OeDmpxIggbUMABYM5HCkJJ/iLXS0=; b=xDm6difFBcWSEyuvXXoDsoqiFLZdL3NzdU/UuBsGndv2Mmg/uPH4rLS8x0aqFC9+k+ 5eUXBb3QE5PChvwEGTgZFkJH1Yj+bOEGfIJ95uXpF4wlNDai6v9yyiofhVr6/HzJ4+Rn peBXmmxvH2+vUD73jqEfMun9DxWnjQxKxXDMZgXo18kDL6QseVutB+YziB322xXrzP3o 5sGpXOxoDsb4EHfVSoTkoQASwDdXAODUqRoJ7hn3BKYxHvyyqU8KTnaETkYTNpwyl6nw mlfFQs+HQqD37jpQo6H37DiGxHm5UGXw+G2UonN87FCtzuJI98z+OUGVjoHvr3Nnhe+z 9IsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708592008; x=1709196808; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=w8UwvKUddBcDJ30OeDmpxIggbUMABYM5HCkJJ/iLXS0=; b=jBH78kD+t7TlE637k78gQt/BVDbh8QWPWJnUWTCASs+BVR87GTwwFUYOLdIzu7CWZu 2FnVD5hKo28BVW1l3/Z5bRbfsfkW8yyGsrRgcf9JSxLMWuRCu6VJ++nSfKi3yp6TO6kr q/TAJgDZhMB9dIVD/Jt2O6m8MtBz0ITa/hneaEdlrC4jv7i5kx8stR3vG3xt8DtJPfOL grUkL3B6ZlxRZeyuepMCNrLN9mQC09LDtnJGA/Y6LpQXTi/XY8MrcQ3uFjY5RZIROHuL PxZ3FLC52Nhn0LCtqsfeC4SKzEdLCrZGFt9kLUl0IJE5LL6xuVdPvI88xww7z09ACwhT L76w== X-Forwarded-Encrypted: i=1; AJvYcCU5KgETQim6Y0Zjgfjl6bXvIGDEmx4dCYiJvv9PBHXwl2qmMZ2YblHmtTWK6K6SYJCTy+fEp8aa5ryAAGKhh+c986vFdneQ7TxieVfX X-Gm-Message-State: AOJu0YxM5hpqYRQ7bbflBxmEot2u2rJ5md+YHey1/ulwtOSjDk9CQg9L yXHk57kXG3mREy6RilA8cRik1FGPPNGM/a+JOnvVLpZEXyrAsGN2hD8r/KOQ9T8= X-Google-Smtp-Source: AGHT+IHnOo2I7r2WPEzhWOsfF+Ao1GprZINhZylx6l+TcqIjYU4pOyVZTVFPvaORJc+oMQDaGku7AQ== X-Received: by 2002:a05:600c:4fd0:b0:411:d929:6e12 with SMTP id o16-20020a05600c4fd000b00411d9296e12mr1464873wmq.17.1708592008662; Thu, 22 Feb 2024 00:53:28 -0800 (PST) Received: from localhost ([102.222.70.76]) by smtp.gmail.com with ESMTPSA id o20-20020a05600c4fd400b00412590eee7csm18262233wmq.10.2024.02.22.00.53.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Feb 2024 00:53:28 -0800 (PST) Date: Thu, 22 Feb 2024 11:53:24 +0300 From: Dan Carpenter To: Dmitry Torokhov , Torsten Hilbrich , Nick Dyer Cc: Jiapeng Chong , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Brad Spengler , Sasha Levin Subject: [PATCH] Input: synaptics-rmi4 - fix use after free (more completely) Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Brad Spengler Grsecurity uses memory poisoning and detected a use after free in rmi_unregister_function(). A fix for this was merged into the grsecurity patchset. I detected the user after free later using static analysis and sent a partial fix as commit eb988e46da2e ("Input: synaptics-rmi4 - fix use after free in rmi_unregister_function()"). However, my patch meant that the grsecurity patchset didn't apply cleanly and forced everyone to re-visit this issue. The bug is that we must not call device_del() until after calling irq_dispose_mapping(). Fixes: 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution to i= rq_domain") Reported-by: Torsten Hilbrich Closes: https://lore.kernel.org/all/1932038e-2776-04ac-5fcd-b15bb3cd088d@se= cunet.com/ Closes: https://bugzilla.kernel.org/show_bug.cgi?id=3D215604 Signed-off-by: Dan Carpenter Acked-by: Mathias Krause --- drivers/input/rmi4/rmi_bus.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/input/rmi4/rmi_bus.c b/drivers/input/rmi4/rmi_bus.c index 1b45b1d3077d..02acc81b9d3e 100644 --- a/drivers/input/rmi4/rmi_bus.c +++ b/drivers/input/rmi4/rmi_bus.c @@ -275,12 +275,11 @@ void rmi_unregister_function(struct rmi_function *fn) rmi_dbg(RMI_DEBUG_CORE, &fn->dev, "Unregistering F%02X.\n", fn->fd.function_number); =20 - device_del(&fn->dev); - of_node_put(fn->dev.of_node); - for (i =3D 0; i < fn->num_of_irqs; i++) irq_dispose_mapping(fn->irq[i]); =20 + device_del(&fn->dev); + of_node_put(fn->dev.of_node); put_device(&fn->dev); } =20 --=20 2.43.0