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 gnoack@google.com
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.
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