From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1195333DEDF; Mon, 20 Apr 2026 16:09:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776701389; cv=none; b=j0jemTlhHprx01fOJHxHykfEi+OyZKWGDDlQeBPDtN0XOVP5RsoXf0Ohx08w+diHlv63/bcTTAo1qxCEbJN7AhZQBQDKFZil1GDOtWURfiR2nrnbt4xDxkopnVLbAn/yqs3aKfn0Bzm9f84twuQQc74hEHN5TZJSWd+7aHoiBso= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776701389; c=relaxed/simple; bh=oRXOs3IIbjhrywYayWehoctM/jNF9Nt3lszGoC9its4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MDpODQzv5ECS+BRdxuRm/ox1FunIB1nhsLOv8xGkV5NJKRS+ZYPJ+22yayIaj7DAVlMwIJ0+RGOCT28dqAHp9VPo2+OEB7zfPBn1OTcJS+loXypoFQtOvukN9UQV0a02vfP9OxONrYw6Six4jfhzuIfUrB2OFlRRi6fC0wviEvI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mzQIwHQ3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="mzQIwHQ3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 61ADFC19425; Mon, 20 Apr 2026 16:09:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776701388; bh=oRXOs3IIbjhrywYayWehoctM/jNF9Nt3lszGoC9its4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mzQIwHQ3TGy6Ofqj7Bnt8igsl9pg6uNpiTKvSaJTbfsNktaOfUHf0lebbU4PnNmj8 Yd4q2e1ji2mx9vpNV7ibojdHnY1jcSgwM2oesBW8yb34cJZFbcwRzIFHDblv+Xhvep vpZ3Jh+rmkIK3Mkf1Z+2Ut7M1xPkZcEwZvtoNX/w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Krzysztof Kozlowski , Alim Akhtar , Andi Shyti , stable Subject: [PATCH 6.12 095/162] i2c: s3c24xx: check the size of the SMBUS message before using it Date: Mon, 20 Apr 2026 17:42:07 +0200 Message-ID: <20260420153930.477130820@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153927.006696811@linuxfoundation.org> References: <20260420153927.006696811@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Kroah-Hartman commit c0128c7157d639a931353ea344fb44aad6d6e17a upstream. The first byte of an i2c SMBUS message is the size, and it should be verified to ensure that it is in the range of 0..I2C_SMBUS_BLOCK_MAX before processing it. This is the same logic that was added in commit a6e04f05ce0b ("i2c: tegra: check msg length in SMBUS block read") to the i2c tegra driver. Cc: Krzysztof Kozlowski Cc: Alim Akhtar Cc: Andi Shyti Cc: stable Assisted-by: gkh_clanker_2000 Signed-off-by: Greg Kroah-Hartman Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/2026022314-rely-scrubbed-4839@gregkh Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-s3c2410.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -504,8 +504,13 @@ static void i2c_s3c_irq_nextbyte(struct i2c->msg->buf[i2c->msg_ptr++] = byte; /* Add actual length to read for smbus block read */ - if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1) + if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1) { + if (byte == 0 || byte > I2C_SMBUS_BLOCK_MAX) { + s3c24xx_i2c_stop(i2c, -EPROTO); + break; + } i2c->msg->len += byte; + } prepare_read: if (is_msglast(i2c)) { /* last byte of buffer */