From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793829307; b=fvA/w92/EqtQTSl2Y7zo7gm3W2kfdxCF5SoqGUlL4y2c0nLF/ygFjjkIgfUgOqnzsv9/ VfHRWn32QS9eM5AagDp0pvZ0hvr3VYKtpqaasr1kDOrYFRXTBKQWZebFd4rPFhg0R3yP4 xndGm0HoQeZaSZGbVfyF0ejZynjrtHjn9rN878yo/uHjLA1mCtPV6Yz0nIJSmDNY7ASPJ pDue+WRRyVf3pDyhlkVC6p2frYYHbXncSfrxFJ7O8G16kbWYGdYmOnxgQ0Gvrh1h57Ps7 /Lj6aXVssuBvU962s/zDr/WCInOBE8vdYb31s3rbak9TkJqn3kwRWfjGjS5YrRgdBXQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793829307; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=RE/RKLdcjGV0Usz16J2Gtu/3q/qySomVUVviDsv5Tx0=; b=K7cHAC6Iwm6QmtEcX++TwKQUS/AHGA2zd+2PU3jOGc16ATjkqoxR6Uzyek2ngz7IxnwN 7bNqJPrKVFDullEAkhRVnInVHp6yGhqhAfNbQTh/8tpqjs26ewKaoWeebImS5a6j+XT4T ZL5HcBS/g3LwcRsCjrnsZxhxWh0fGHp/Zy1SlDQpEGj+n46OO+viGkG9am4lzzkrABAW3 k9jUUnLQzDBOs1OOiJ75Sjh9L62JMEF8KlQrSkuK14urpvz4jqpuKGOOMAj1cnrRiJInB LP9lUlwPyYgxhRgPF1wUlqRW6PF7KXStxlpKF5smWpIHm/+sCC2fggQ7XNSpHFARkgw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=TBQaDFfA; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2AA606074918; Wed, 4 Nov 2026 21:55:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=TBQaDFfA Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEE041F00A02; Wed, 4 Nov 2026 21:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793829307; bh=RE/RKLdcjGV0Usz16J2Gtu/3q/qySomVUVviDsv5Tx0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=TBQaDFfAxuHG5GBFNgl6R/i352ImUUBO5RSM6OY48m78tvFLr0G5Q1zO1m0qncUe8 zWEJD3FqmsrZP2M3BIm29SJlHnkBxEfMWxIG/2oI5N6xexxoKQ1BeFIpiO+3Uds8z+ exk/GodQcnWDsqOrQSHPkVMoNgiDnNvztztQdO08= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bryam Vargas , Andy Shevchenko , Jonathan Cameron , Sasha Levin Subject: [PATCH 6.18 0042/1005] iio: accel: fxls8962af: clamp the device-reported FIFO sample count Date: Wed, 4 Nov 2026 15:56:15 -0500 Message-ID: <20261104211044.759471022@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bryam Vargas [ Upstream commit 2f8225b91eb478ca2e9aec8aaef4d229765bcebe ] fxls8962af_fifo_flush() transfers the sample count the device reports in BUF_STATUS into an on-stack buffer sized for FXLS8962AF_FIFO_LENGTH (32) samples, but the count is a 6-bit field (0..63) that is only checked for zero. A device, or an attacker on the I2C/SPI bus, reporting 33..63 overflows the buffer by up to 186 bytes: a stack out-of-bounds write. Clamp the count to FXLS8962AF_FIFO_LENGTH before the transfer, mirroring the clamp already applied in fxls8962af_set_watermark(). Conforming hardware reports at most that many samples and is unaffected. Signed-off-by: Bryam Vargas Reviewed-by: Andy Shevchenko Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/accel/fxls8962af-core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iio/accel/fxls8962af-core.c b/drivers/iio/accel/fxls8962af-core.c index 8763e91c63d2b..1ecffbf41f64f 100644 --- a/drivers/iio/accel/fxls8962af-core.c +++ b/drivers/iio/accel/fxls8962af-core.c @@ -970,6 +970,8 @@ static int fxls8962af_fifo_flush(struct iio_dev *indio_dev) if (!count) return 0; + count = min(count, FXLS8962AF_FIFO_LENGTH); + data->old_timestamp = data->timestamp; data->timestamp = iio_get_time_ns(indio_dev); -- 2.53.0