On Jul 17 2014 or thereabouts, Andrew Duggan wrote: > It is possible that the hid-rmi driver could get loaded onto a device which does not have the > expected report ids. This should not happen because it would indicate that the hid-rmi driver is > not compatible with that device. However, if it does happen it should return an error from probe > instead of dereferencing a null pointer. > > related bug: > https://bugzilla.kernel.org/show_bug.cgi?id=80091 > > Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx> > --- > Added hid_err messages as suggested by Benjamin. This fixes the null pointer dereference from > bug 80091 while the next patch addresses the binding issue in hid-core. Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> Cheers, Benjamin > > drivers/hid/hid-rmi.c | 28 ++++++++++++++++++++++------ > 1 file changed, 22 insertions(+), 6 deletions(-) > > diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c > index 3221a95..260be7a 100644 > --- a/drivers/hid/hid-rmi.c > +++ b/drivers/hid/hid-rmi.c > @@ -848,6 +848,8 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id) > struct rmi_data *data = NULL; > int ret; > size_t alloc_size; > + struct hid_report *input_report; > + struct hid_report *output_report; > > data = devm_kzalloc(&hdev->dev, sizeof(struct rmi_data), GFP_KERNEL); > if (!data) > @@ -866,12 +868,26 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id) > return ret; > } > > - data->input_report_size = (hdev->report_enum[HID_INPUT_REPORT] > - .report_id_hash[RMI_ATTN_REPORT_ID]->size >> 3) > - + 1 /* report id */; > - data->output_report_size = (hdev->report_enum[HID_OUTPUT_REPORT] > - .report_id_hash[RMI_WRITE_REPORT_ID]->size >> 3) > - + 1 /* report id */; > + input_report = hdev->report_enum[HID_INPUT_REPORT] > + .report_id_hash[RMI_ATTN_REPORT_ID]; > + if (!input_report) { > + hid_err(hdev, "device does not have expected input report\n"); > + ret = -ENODEV; > + return ret; > + } > + > + data->input_report_size = (input_report->size >> 3) + 1 /* report id */; > + > + output_report = hdev->report_enum[HID_OUTPUT_REPORT] > + .report_id_hash[RMI_WRITE_REPORT_ID]; > + if (!output_report) { > + hid_err(hdev, "device does not have expected output report\n"); > + ret = -ENODEV; > + return ret; > + } > + > + data->output_report_size = (output_report->size >> 3) > + + 1 /* report id */; > > alloc_size = data->output_report_size + data->input_report_size; > > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
