From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=115.124.28.97 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793951499; b=QMVuXbPpXyoEK3aHmsOT2eZyVBQPSb2Rjt1RS4M5ChMoNSKav2ajIWdcjui7t7hKZ1kL sU+JhIjtkoegtOBiSQzVgLHLdkp9+MfFNCL7eaFcmEBSkz65R+wN9kmuZ4i0PKwCpURVv 9ia3Z/K5KisT0Q+K2Q25EL9HhKWxSWORrLTHT0I4mU0QKWo2w64JNkv9B6o0+pUpxYlSi C8EvvTSOH5LmtoYj8o29Pm6hnu6R0iJA2AF2FrKeCAYpTymKqPwVjvV2KT4HxQ99Eubz2 SzKXS2jh7KpMqRSfZUqI0p2zYYmnkAwq+qjlQ2wnFVGJjtyyRNKgM8l4KJ8VxzZcCrA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793951499; h=DMARC-Filter:DKIM-Signature:X-Alimail-AntiSpam:Received:From:To:Cc: Subject:Date:Message-ID:X-Mailer:MIME-Version: Content-Transfer-Encoding; bh=X3nxSXG+H2J8k8t3k6poogjxQFJaTHXAguqehE2TWiY=; b=W4cQHTbnMn0NwDBruLxGkAt3JN9MZpev8qUFxYsTW0lX/lBet741qs6GuwNG3rL+ZwLS ns0XluXDb8ZpXVG6bRX/odgSlJ8OZs0TFpoz3W3MPsCwCiCIcKkKZGbeYk2FFkwLZcY8+ 6AxYHrPXvaE8hushfAQ/yci5GioU8W2bxXk0WUEP/bntw9mpUGe8gZB0EYr9oGQYeXUxv yT5t0NgGwYhOzr+mgn8rTeAg6SsJSmYtT5jrGdf5YD021lXtxeXJNq9a9B0z3TDD+vAPD YQjXeweja2MllTmNXxAl37aMhv/PXBvbOSV/JboTBR9pR2+aYbhzsKFdG1p3jAheetg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none header.from=xiaopeng.com; spf=pass smtp.mailfrom=xiaopeng.com; dkim=pass header.d=xiaopeng.com header.i=@xiaopeng.com header.a=rsa-sha256 header.s=default header.b=EdBOOO5d; arc=none smtp.remote-ip=115.124.28.97 Received: from out28-97.mail.aliyun.com (out28-97.mail.aliyun.com [115.124.28.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 576A7606A326; Fri, 6 Nov 2026 07:51:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 576A7606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=xiaopeng.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=xiaopeng.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=xiaopeng.com header.i=@xiaopeng.com header.a=rsa-sha256 header.s=default header.b=EdBOOO5d DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=xiaopeng.com; s=default; t=1793951489; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=X3nxSXG+H2J8k8t3k6poogjxQFJaTHXAguqehE2TWiY=; b=EdBOOO5d/HlK/xdK+U63qbsCipbHTOjNjstrXi49twguHyNCSFWfk4udWTjT++l+gs7f4/JjR6BY1sbl1pNhGqsabFd7UqgnLXopyDkZIJKCx6lqYgei7RSKnt1Kbx0fYVrLo9zU5ulAIWNisZgvIILVcRMU1/NTFOLmymFqTVY= X-Alimail-AntiSpam:AC=CONTINUE;BC=0.07707597|-1;CH=green;DM=|CONTINUE|false|;DS=CONTINUE|ham_regular_dialog|0.003847-0.000952075-0.995201;FP=12758894924369871956|0|0|0|0|-1|-1|-1;HT=maildocker-contentspam033037034254;MF=liuc63@xiaopeng.com;NM=1;PH=DS;RN=15;RT=15;SR=0;TI=SMTPD_---.jy77D-U_1793951487; Received: from localhost(mailfrom:liuc63@xiaopeng.com fp:SMTPD_---.jy77D-U_1793951487 cluster:ay29) by smtp.aliyun-inc.com; Fri, 06 Nov 2026 15:51:28 +0800 From: Liu Chao To: Dmitry Torokhov Cc: Markus Schneider-Pargmann , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Juergen Borleis , Denis Carikli , Lee Jones , fangxy@xiaopeng.com, linux-input@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] Input: mx25-tcq - clamp the FIFO sample count to the buffer size Date: Fri, 6 Nov 2026 15:51:27 +0800 Message-ID: <20261106075127.3105907-1-liuc63@xiaopeng.com> X-Mailer: git-send-email 2.50.1 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit MX25_ADCQ_SR_FDN() reports up to 31 pending samples. The IRQ thread aligns the count down to a multiple of the sample count but never bounds it by the size of sample_buf, so a FIFO backlog larger than TSC_MAX_SAMPLES overruns the stack buffer. Clamp the count before the alignment so that the result stays a multiple of sample_count. Fixes: 4f7ed234f2a5 ("Input: touchscreen: Add imx25 TCQ driver") Cc: stable@vger.kernel.org Signed-off-by: Liu Chao --- drivers/input/touchscreen/fsl-imx25-tcq.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/input/touchscreen/fsl-imx25-tcq.c b/drivers/input/touchscreen/fsl-imx25-tcq.c index ff270b3b8572..fa8d8b736723 100644 --- a/drivers/input/touchscreen/fsl-imx25-tcq.c +++ b/drivers/input/touchscreen/fsl-imx25-tcq.c @@ -319,6 +319,7 @@ static irqreturn_t mx25_tcq_irq_thread(int irq, void *dev_id) */ regmap_read(priv->regs, MX25_ADCQ_SR, &stats); samples = MX25_ADCQ_SR_FDN(stats); + samples = min_t(unsigned int, samples, TSC_MAX_SAMPLES); samples -= samples % priv->sample_count; if (!samples) -- 2.50.1