linux-kernel - Re: [PATCH] usbmon: Fix out-of-bounds read in mon_copy_to

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Message-ID: <2025070322-overstay-compacter-3544@gregkh>
Date: Thu, 3 Jul 2025 07:12:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: manas18244@...td.ac.in
Cc: Pete Zaitcev <zaitcev@...hat.com>, Paolo Abeni <paolo.abeni@...il.it>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	syzbot+86b6d7c8bcc66747c505@...kaller.appspotmail.com
Subject: Re: [PATCH] usbmon: Fix out-of-bounds read in mon_copy_to_buff

On Thu, Jul 03, 2025 at 02:57:40AM +0530, Manas Gupta via B4 Relay wrote:
> From: Manas Gupta <manas18244@...td.ac.in>
> 
> memcpy tries to copy buffer 'from' when it is empty. This leads to
> out-of-bounds crash.

What exactly is the "crash" that you are seeing?  What is reporting it,
and how?

thanks,

greg k-h