linux-kernel - Re: [PATCH v4 4/8] bus: mhi: core: Read transfer length from an event properly

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Message-ID: <4e187d13-951d-4833-ea82-577b0e755521@codeaurora.org>
Date:   Mon, 4 May 2020 08:31:25 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>, mani@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        hemantk@...eaurora.org
Subject: Re: [PATCH v4 4/8] bus: mhi: core: Read transfer length from an event
 properly

On 5/1/2020 8:32 PM, Bhaumik Bhatt wrote:
> From: Hemant Kumar <hemantk@...eaurora.org>
> 
> When MHI Driver receives an EOT event, it reads xfer_len from the
> event in the last TRE. The value is under control of the MHI device
> and never validated by Host MHI driver. The value should never be
> larger than the real size of the buffer but a malicious device can
> set the value 0xFFFF as maximum. This causes driver to memory
> overflow (both read or write). Fix this issue by reading minimum of
> transfer length from event and the buffer length provided.
> 
> Signed-off-by: Hemant Kumar <hemantk@...eaurora.org>
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>

Reviewed-by: Jeffrey Hugo <jhugo@...eaurora.org>

-- 
Jeffrey Hugo
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.