CHERRY-PICK: UPSTREAM: HID: hid-logitech: Collect report descriptors before sending

The current code allows several consecutive calls to hid_parse_report(),
which may have happened to work before, but would cause a memory leak
and generally be incorrect. This patch collects all the reports
before sending them once.

BUG=chromium-os:39354
TEST=manually tested on Link

(cherry picked from upstream commit 2a039bf5a6caa6b41c3839c1e3a19b20fb38270b)
Change-Id: Ide9e8c95c99e27a9cb28e1f88c54a12c65098aa6
Cc: Nestor Lopez Casado <nlopezcasad@logitech.com>
Tested-by: Benjamin Tissoires <benjamin.tissoires@gmail.com
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-on: https://gerrit.chromium.org/gerrit/45999
Reviewed-by: Yufeng Shen <miletus@chromium.org>
Commit-Queue: Andrew de los Reyes <adlr@chromium.org>
Tested-by: Andrew de los Reyes <adlr@chromium.org>

diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 2b56efc..e1c38bb 100644 (file)
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -155,6 +155,14 @@ static const char media_descriptor[] = {
 /* Maximum size of all defined hid reports in bytes (including report id) */
 #define MAX_REPORT_SIZE 8
 
+/* Make sure all descriptors are present here */
+#define MAX_RDESC_SIZE                         \
+       (sizeof(kbd_descriptor) +               \
+        sizeof(mse_descriptor) +               \
+        sizeof(consumer_descriptor) +          \
+        sizeof(syscontrol_descriptor) +        \
+        sizeof(media_descriptor))
+
 /* Number of possible hid report types that can be created by this driver.
  *
  * Right now, RF report types have the same report types (or report id's)
@@ -473,9 +481,17 @@ static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
        return 0;
 }
 
+static void rdcat(char **rdesc, unsigned int *rsize, const char *data, unsigned int size)
+{
+       memcpy(*rdesc + *rsize, data, size);
+       *rsize += size;
+}
+
 static int logi_dj_ll_parse(struct hid_device *hid)
 {
        struct dj_device *djdev = hid->driver_data;
+       unsigned int rsize = 0;
+       char *rdesc;
        int retval;
 
        dbg_hid("%s\n", __func__);
@@ -483,70 +499,38 @@ static int logi_dj_ll_parse(struct hid_device *hid)
        djdev->hdev->version = 0x0111;
        djdev->hdev->country = 0x00;
 
+       rdesc = kmalloc(MAX_RDESC_SIZE, GFP_KERNEL);
+       if (!rdesc)
+               return -ENOMEM;
+
        if (djdev->reports_supported & STD_KEYBOARD) {
                dbg_hid("%s: sending a kbd descriptor, reports_supported: %x\n",
                        __func__, djdev->reports_supported);
-               retval = hid_parse_report(hid,
-                                         (u8 *) kbd_descriptor,
-                                         sizeof(kbd_descriptor));
-               if (retval) {
-                       dbg_hid("%s: sending a kbd descriptor, hid_parse failed"
-                               " error: %d\n", __func__, retval);
-                       return retval;
-               }
+               rdcat(&rdesc, &rsize, kbd_descriptor, sizeof(kbd_descriptor));
        }
 
        if (djdev->reports_supported & STD_MOUSE) {
                dbg_hid("%s: sending a mouse descriptor, reports_supported: "
                        "%x\n", __func__, djdev->reports_supported);
-               retval = hid_parse_report(hid,
-                                         (u8 *) mse_descriptor,
-                                         sizeof(mse_descriptor));
-               if (retval) {
-                       dbg_hid("%s: sending a mouse descriptor, hid_parse "
-                               "failed error: %d\n", __func__, retval);
-                       return retval;
-               }
+               rdcat(&rdesc, &rsize, mse_descriptor, sizeof(mse_descriptor));
        }
 
        if (djdev->reports_supported & MULTIMEDIA) {
                dbg_hid("%s: sending a multimedia report descriptor: %x\n",
                        __func__, djdev->reports_supported);
-               retval = hid_parse_report(hid,
-                                         (u8 *) consumer_descriptor,
-                                         sizeof(consumer_descriptor));
-               if (retval) {
-                       dbg_hid("%s: sending a consumer_descriptor, hid_parse "
-                               "failed error: %d\n", __func__, retval);
-                       return retval;
-               }
+               rdcat(&rdesc, &rsize, consumer_descriptor, sizeof(consumer_descriptor));
        }
 
        if (djdev->reports_supported & POWER_KEYS) {
                dbg_hid("%s: sending a power keys report descriptor: %x\n",
                        __func__, djdev->reports_supported);
-               retval = hid_parse_report(hid,
-                                         (u8 *) syscontrol_descriptor,
-                                         sizeof(syscontrol_descriptor));
-               if (retval) {
-                       dbg_hid("%s: sending a syscontrol_descriptor, "
-                               "hid_parse failed error: %d\n",
-                               __func__, retval);
-                       return retval;
-               }
+               rdcat(&rdesc, &rsize, syscontrol_descriptor, sizeof(syscontrol_descriptor));
        }
 
        if (djdev->reports_supported & MEDIA_CENTER) {
                dbg_hid("%s: sending a media center report descriptor: %x\n",
                        __func__, djdev->reports_supported);
-               retval = hid_parse_report(hid,
-                                         (u8 *) media_descriptor,
-                                         sizeof(media_descriptor));
-               if (retval) {
-                       dbg_hid("%s: sending a media_descriptor, hid_parse "
-                               "failed error: %d\n", __func__, retval);
-                       return retval;
-               }
+               rdcat(&rdesc, &rsize, media_descriptor, sizeof(media_descriptor));
        }
 
        if (djdev->reports_supported & KBD_LEDS) {
@@ -554,7 +538,10 @@ static int logi_dj_ll_parse(struct hid_device *hid)
                        __func__, djdev->reports_supported);
        }
 
-       return 0;
+       retval = hid_parse_report(hid, rdesc, rsize);
+       kfree(rdesc);
+
+       return retval;
 }
 
 static int logi_dj_ll_input_event(struct input_dev *dev, unsigned int type,