diff options
| author | Andrew Duggan <aduggan@synaptics.com> | 2014-07-17 16:14:44 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2014-07-29 11:28:49 +0200 |
| commit | dd3edeb6a0267029bc3ffc480fb41dffb9081844 (patch) | |
| tree | 85754fa3a11469707d9c67977df1ec7bec6c6c5e /drivers/hid/hid-rmi.c | |
| parent | 01a5f8a401a2a525b9546d65ddf69aaba37f288d (diff) | |
| download | linux-dd3edeb6a0267029bc3ffc480fb41dffb9081844.tar.bz2 | |
HID: rmi: check that report ids exist in the report_id_hash before accessing their size
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@synaptics.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-rmi.c')
| -rw-r--r-- | drivers/hid/hid-rmi.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c index 2c3524bacca6..0dc25142f451 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; |