HID: LG: validate HID output report details

A HID device could send a malicious output report that would cause the
lg, lg3, and lg4 HID drivers to write beyond the output report allocation
during an event, causing a heap overflow:

[  325.245240] usb 1-1: New USB device found, idVendor=046d, idProduct=c287
...
[  414.518960] BUG kmalloc-4096 (Not tainted): Redzone overwritten

Additionally, while lg2 did correctly validate the report details, it was
cleaned up and shortened.

CVE-2013-2893

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-lg2ff.c b/drivers/hid/hid-lg2ff.c
index b3cd150..1a42eaa 100644 (file)
--- a/drivers/hid/hid-lg2ff.c
+++ b/drivers/hid/hid-lg2ff.c
@@ -64,26 +64,13 @@ int lg2ff_init(struct hid_device *hid)
        struct hid_report *report;
        struct hid_input *hidinput = list_entry(hid->inputs.next,
                                                struct hid_input, list);
-       struct list_head *report_list =
-                       &hid->report_enum[HID_OUTPUT_REPORT].report_list;
        struct input_dev *dev = hidinput->input;
        int error;
 
-       if (list_empty(report_list)) {
-               hid_err(hid, "no output report found\n");
+       /* Check that the report looks ok */
+       report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
+       if (!report)
                return -ENODEV;
-       }
-
-       report = list_entry(report_list->next, struct hid_report, list);
-
-       if (report->maxfield < 1) {
-               hid_err(hid, "output report is empty\n");
-               return -ENODEV;
-       }
-       if (report->field[0]->report_count < 7) {
-               hid_err(hid, "not enough values in the field\n");
-               return -ENODEV;
-       }
 
        lg2ff = kmalloc(sizeof(struct lg2ff_device), GFP_KERNEL);
        if (!lg2ff)

diff --git a/drivers/hid/hid-lg3ff.c b/drivers/hid/hid-lg3ff.c
index e52f181..8c2da18 100644 (file)
--- a/drivers/hid/hid-lg3ff.c
+++ b/drivers/hid/hid-lg3ff.c
@@ -66,10 +66,11 @@ static int hid_lg3ff_play(struct input_dev *dev, void *data,
        int x, y;
 
 /*
- * Maxusage should always be 63 (maximum fields)
- * likely a better way to ensure this data is clean
+ * Available values in the field should always be 63, but we only use up to
+ * 35. Instead, clear the entire area, however big it is.
  */
-       memset(report->field[0]->value, 0, sizeof(__s32)*report->field[0]->maxusage);
+       memset(report->field[0]->value, 0,
+              sizeof(__s32) * report->field[0]->report_count);
 
        switch (effect->type) {
        case FF_CONSTANT:
@@ -129,32 +130,14 @@ static const signed short ff3_joystick_ac[] = {
 int lg3ff_init(struct hid_device *hid)
 {
        struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
-       struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
        struct input_dev *dev = hidinput->input;
-       struct hid_report *report;
-       struct hid_field *field;
        const signed short *ff_bits = ff3_joystick_ac;
        int error;
        int i;
 
-       /* Find the report to use */
-       if (list_empty(report_list)) {
-               hid_err(hid, "No output report found\n");
-               return -1;
-       }
-
        /* Check that the report looks ok */
-       report = list_entry(report_list->next, struct hid_report, list);
-       if (!report) {
-               hid_err(hid, "NULL output report\n");
-               return -1;
-       }
-
-       field = report->field[0];
-       if (!field) {
-               hid_err(hid, "NULL field\n");
-               return -1;
-       }
+       if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35))
+               return -ENODEV;
 
        /* Assume single fixed device G940 */
        for (i = 0; ff_bits[i] >= 0; i++)

diff --git a/drivers/hid/hid-lg4ff.c b/drivers/hid/hid-lg4ff.c
index 0ddae2a..8782fe1 100644 (file)
--- a/drivers/hid/hid-lg4ff.c
+++ b/drivers/hid/hid-lg4ff.c
@@ -484,34 +484,16 @@ static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cde
 int lg4ff_init(struct hid_device *hid)
 {
        struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
-       struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
        struct input_dev *dev = hidinput->input;
-       struct hid_report *report;
-       struct hid_field *field;
        struct lg4ff_device_entry *entry;
        struct lg_drv_data *drv_data;
        struct usb_device_descriptor *udesc;
        int error, i, j;
        __u16 bcdDevice, rev_maj, rev_min;
 
-       /* Find the report to use */
-       if (list_empty(report_list)) {
-               hid_err(hid, "No output report found\n");
-               return -1;
-       }
-
        /* Check that the report looks ok */
-       report = list_entry(report_list->next, struct hid_report, list);
-       if (!report) {
-               hid_err(hid, "NULL output report\n");
+       if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
                return -1;
-       }
-
-       field = report->field[0];
-       if (!field) {
-               hid_err(hid, "NULL field\n");
-               return -1;
-       }
 
        /* Check what wheel has been connected */
        for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {

diff --git a/drivers/hid/hid-lgff.c b/drivers/hid/hid-lgff.c
index d7ea8c8..e1394af 100644 (file)
--- a/drivers/hid/hid-lgff.c
+++ b/drivers/hid/hid-lgff.c
@@ -128,27 +128,14 @@ static void hid_lgff_set_autocenter(struct input_dev *dev, u16 magnitude)
 int lgff_init(struct hid_device* hid)
 {
        struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
-       struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
        struct input_dev *dev = hidinput->input;
-       struct hid_report *report;
-       struct hid_field *field;
        const signed short *ff_bits = ff_joystick;
        int error;
        int i;
 
-       /* Find the report to use */
-       if (list_empty(report_list)) {
-               hid_err(hid, "No output report found\n");
-               return -1;
-       }
-
        /* Check that the report looks ok */
-       report = list_entry(report_list->next, struct hid_report, list);
-       field = report->field[0];
-       if (!field) {
-               hid_err(hid, "NULL field\n");
-               return -1;
-       }
+       if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7))
+               return -ENODEV;
 
        for (i = 0; i < ARRAY_SIZE(devices); i++) {
                if (dev->id.vendor == devices[i].idVendor &&