linux-kernel - Re: [syzbot] [usb?] WARNING in dib0700_i2c_xfer/usb_submit

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Message-ID: <Z-GwRNe8NIigXYtS@shikoro>
Date: Mon, 24 Mar 2025 20:19:32 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Alan Stern <stern@...land.harvard.edu>
Cc: syzbot <syzbot+c38e5e60d0041a99dbf5@...kaller.appspotmail.com>,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com,
	linux-i2c@...r.kernel.org
Subject: Re: [syzbot] [usb?] WARNING in dib0700_i2c_xfer/usb_submit_urb


> As far as I can tell from the source code, the dib0700 simply isn't able 
> to handle 0-length reads.  Should the dib0700_ctrl_rd() routine be 
> changed simply to return 0 in such cases?

The adapter (I assume the one in dvb-usb-i2c.c) should populate an
i2c_adapter_quirks struct with I2C_AQ_NO_ZERO_LEN and then the core will
bail out for you.


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