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 7A2E335971E; Fri, 9 Jan 2026 13:01:39 +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=1767963699; cv=none; b=IW/eDHzKRTfY/6ev4LwoLinTbZEyykcvLIifTWasecZAtU/ibbF7NRcXJYKlj9GmvelEAOCC3+wee+qpFY4x3ZEg5kbX9b+9vJcCAJ9ivL9bolOlz1EYy4RvNfTGfNfxhWrV4gIXoA8xF8InwqOcVP9azHtQK6vkRFWojj5AdMU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767963699; c=relaxed/simple; bh=k5A3WMP1tURQUV8YTaLgX8u93ATym8rJbdZ7P43xNSw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=k7mLhttfnEc0kqRSfyuUBqYF+iAvR6xEPNZzD3Rxem3U1Ylq3v2e/pduU3ofZOF5RWtSvWoMEqkIMpCgRTKTO+Kx2ppT/o0bkibpfOQHa9w4n/GL9ZW9hWakszCL3JNyyrMko5z9chbJpWR0kSIgbrOm6PWh73TXhonW8gSFP9E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=i/ATWbT4; 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="i/ATWbT4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04D74C4CEF1; Fri, 9 Jan 2026 13:01:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767963699; bh=k5A3WMP1tURQUV8YTaLgX8u93ATym8rJbdZ7P43xNSw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=i/ATWbT4prdWjG98CYbmVw4tjZj8UEN6+C/3ltLVWXA65MLd6pxISSDlNezIHUwr2 jQTXs0dwgYMk4IIekeuci2aI818BWvkL8ipzg1B4vrRPDXJk56gu8sQ+AV36JdIe98 ukG4QEVdWJHW/g9u5+ndhqfp569jMmcj9GuNtWzM= Date: Fri, 9 Jan 2026 14:00:28 +0100 From: Greg KH To: =?iso-8859-1?Q?G=FCnther?= Noack Cc: Filipe =?iso-8859-1?Q?La=EDns?= , Bastien Nocera , Jiri Kosina , Benjamin Tissoires , stable@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] HID: logitech-hidpp: Check maxfield in hidpp_get_report_length() Message-ID: <2026010909-trapped-kindly-1cdf@gregkh> References: <20260109122557.3166556-3-gnoack@google.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260109122557.3166556-3-gnoack@google.com> On Fri, Jan 09, 2026 at 01:25:58PM +0100, Günther Noack wrote: > Do not crash when a report has no fields. > > Fake USB gadgets can send their own HID report descriptors and can define report > structures without valid fields. This can be used to crash the kernel over USB. > > Cc: stable@vger.kernel.org > Signed-off-by: Günther Noack > --- > drivers/hid/hid-logitech-hidpp.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c > index 9ced0e4d46ae..c5e132a6c085 100644 > --- a/drivers/hid/hid-logitech-hidpp.c > +++ b/drivers/hid/hid-logitech-hidpp.c > @@ -4313,7 +4313,7 @@ static int hidpp_get_report_length(struct hid_device *hdev, int id) > > re = &(hdev->report_enum[HID_OUTPUT_REPORT]); > report = re->report_id_hash[id]; > - if (!report) > + if (!report || !report->maxfield) > return 0; > > return report->field[0]->report_count + 1; > -- > 2.52.0.457.g6b5491de43-goog > Hi, This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree. You are receiving this message because of the following common error(s) as indicated below: - This looks like a new version of a previously submitted patch, but you did not list below the --- line any changes from the previous version. Please read the section entitled "The canonical patch format" in the kernel file, Documentation/process/submitting-patches.rst for what needs to be done here to properly describe this. If you wish to discuss this problem further, or you have questions about how to resolve this issue, please feel free to respond to this email and Greg will reply once he has dug out from the pending patches received from other developers. thanks, greg k-h's patch email bot