From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 970FB3624CC; Sat, 12 Sep 2026 18:20:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237204; cv=none; b=kFVrcEVBrz9wdE/7VI5ykSDpzs/vDwyYYGOK+/8PGpnizaN1uPNncqp0wRW7Qt2wOviW4K+meazjy3Xvgl2AfmdFPHeQmDENibWy9q99E7FeM9bjxw3KuMBDDsFdLXqjM+b4T6mjH4y2vUsh3lIkK5YswQZRhh9USh7RfEajrZE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237204; c=relaxed/simple; bh=XOWGe9NS53/Etm1TXRq5lZm7jYyVXzirQko6dojF9mY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kdLcwwngzGphcNZo+rMseFJKPlEJrgv9P2VaPHX4yK0kE8+3xZzRuXDJcx6dG0sk7s1QH/hqeihhuWPAqAfSD/mFJelnbxUtdE0lw+7e8TuNG9j+5znnH+KWWB9luLNLGJI0Z1/AzdLv3bZ6RrP4isUPONiGByXEn5rafpRmuRg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UyFti7P8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UyFti7P8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E77C1F000FF; Sat, 12 Sep 2026 18:20:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789237203; bh=qFqW4bqrqPZJBeah+L6Nt8+5H93UyRrrEpNFkCrme6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UyFti7P8Csa848xA40FnNz7+HIDQXNVbF16duWjy0MrYdcP0ejQtuS8mHsHhgtClw qvkR7uaVP0uO93S/nvS4ZnIwvl+D3jp+2N9OZb1+hn+JotgTruUofwC3tlonWyP54j RU8NIIjhaauvC+ztQ52E3zgtKueew1tP8Wx5JXtc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Maoyi Xie , Andi Shyti , Krzysztof Kozlowski Subject: [PATCH 5.15 209/935] w1: ds28e17: reject an oversize length on an I2C block read Date: Sat, 12 Sep 2026 08:53:59 +0200 Message-ID: <20260912065531.620198960@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maoyi Xie commit 169ae5e65e5aaf213b6a578f6478a9fd2e523606 upstream. w1_f19_i2c_master_transfer() is the master_xfer for the DS28E17 1-Wire to I2C bridge. On an I2C_M_RECV_LEN read, it takes the length from the device. The downstream slave puts a length byte in buf[0]. The driver then reads that many bytes into buf[1] with w1_f19_i2c_read(). buf[0] is controlled by the device and can be 0 to 255. w1_f19_i2c_read() only rejects a zero count. The caller buffer is I2C_SMBUS_BLOCK_MAX + 2, so 34 bytes. A length above 32 makes the read run past it, up to about 222 bytes out of bounds. The SMBus core does check buf[0] against I2C_SMBUS_BLOCK_MAX. That check runs after master_xfer returns. By then the write is already done. i2c-algo-bit rejects an oversize length before it copies, and returns -EPROTO. Reject a length above I2C_SMBUS_BLOCK_MAX at both RECV_LEN sites, the same way i2c-algo-bit does. Fixes: ebc4768ac497 ("add w1_ds28e17 driver for the DS28E17 Onewire to I2C master bridge") Cc: stable@vger.kernel.org Signed-off-by: Maoyi Xie Reviewed-by: Andi Shyti Link: https://patch.msgid.link/20260629121043.199487-1-maoyixie.tju@gmail.com Signed-off-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman --- drivers/w1/slaves/w1_ds28e17.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/w1/slaves/w1_ds28e17.c +++ b/drivers/w1/slaves/w1_ds28e17.c @@ -389,6 +389,10 @@ static int w1_f19_i2c_master_transfer(st * another simple read in that case. */ if (msgs[i+1].flags & I2C_M_RECV_LEN) { + if (msgs[i+1].buf[0] > I2C_SMBUS_BLOCK_MAX) { + i = -EPROTO; + goto error; + } result = w1_f19_i2c_read(sl, msgs[i+1].addr, &(msgs[i+1].buf[1]), msgs[i+1].buf[0]); if (result < 0) { @@ -415,6 +419,10 @@ static int w1_f19_i2c_master_transfer(st * another simple read in that case. */ if (msgs[i].flags & I2C_M_RECV_LEN) { + if (msgs[i].buf[0] > I2C_SMBUS_BLOCK_MAX) { + i = -EPROTO; + goto error; + } result = w1_f19_i2c_read(sl, msgs[i].addr, &(msgs[i].buf[1]),