From: kernel test robot <lkp@intel.com>
To: Joshua Leivenzon <hacker1024@users.sourceforge.net>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
linux-input@vger.kernel.org, Jiri Kosina <jikos@kernel.org>
Subject: [hid:for-7.2/asus 1/7] drivers/hid/hid-asus.c:1399:14: warning: variable 'rsize_orig' is used uninitialized whenever 'if' condition is false
Date: Thu, 11 Jun 2026 06:05:53 +0200 [thread overview]
Message-ID: <202606110526.QfgiXQTQ-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-7.2/asus
head: 9bde6277292c8233fb24fc6e51323027b49d1cde
commit: 92f9f783f013a27a175089950b7b22c3d5a48249 [1/7] HID: asus: Fix up Zenbook Duo report descriptors
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260611/202606110526.QfgiXQTQ-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project f43d6834093b19baf79beda8c0337ab020ac5f17)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260611/202606110526.QfgiXQTQ-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606110526.QfgiXQTQ-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/hid/hid-asus.c:1399:14: warning: variable 'rsize_orig' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
1399 | } else if (drvdata->quirks & QUIRK_ZENBOOK_DUO_KEYBOARD) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hid/hid-asus.c:1410:17: note: uninitialized use occurs here
1410 | if (*rsize == rsize_orig &&
| ^~~~~~~~~~
drivers/hid/hid-asus.c:1399:10: note: remove the 'if' if its condition is always true
1399 | } else if (drvdata->quirks & QUIRK_ZENBOOK_DUO_KEYBOARD) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/hid/hid-asus.c:1390:17: note: initialize the variable 'rsize_orig' to silence this warning
1390 | int rsize_orig;
| ^
| = 0
1 warning generated.
vim +1399 drivers/hid/hid-asus.c
1370
1371 static const __u8 *asus_report_fixup(struct hid_device *hdev, __u8 *rdesc,
1372 unsigned int *rsize)
1373 {
1374 struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
1375
1376 if (drvdata->quirks & QUIRK_FIX_NOTEBOOK_REPORT &&
1377 *rsize >= 56 && rdesc[54] == 0x25 && rdesc[55] == 0x65) {
1378 hid_info(hdev, "Fixing up Asus notebook report descriptor\n");
1379 rdesc[55] = 0xdd;
1380 }
1381 /* For the T100TA/T200TA keyboard dock */
1382 if (drvdata->quirks & QUIRK_T100_KEYBOARD &&
1383 (*rsize == 76 || *rsize == 101) &&
1384 rdesc[73] == 0x81 && rdesc[74] == 0x01) {
1385 hid_info(hdev, "Fixing up Asus T100 keyb report descriptor\n");
1386 rdesc[74] &= ~HID_MAIN_ITEM_CONSTANT;
1387 }
1388 /* For the T100CHI/T90CHI keyboard dock and Zenbook Duo 2024+ keyboards */
1389 if (drvdata->quirks & (QUIRK_T100CHI | QUIRK_T90CHI | QUIRK_ZENBOOK_DUO_KEYBOARD)) {
1390 int rsize_orig;
1391 int offs;
1392
1393 if (drvdata->quirks & QUIRK_T100CHI) {
1394 rsize_orig = 403;
1395 offs = 388;
1396 } else if (drvdata->quirks & QUIRK_T90CHI) {
1397 rsize_orig = 306;
1398 offs = 291;
> 1399 } else if (drvdata->quirks & QUIRK_ZENBOOK_DUO_KEYBOARD) {
1400 rsize_orig = 257;
1401 offs = 176;
1402 }
1403
1404 /*
1405 * Change Usage (76h) to Usage Minimum (00h), Usage Maximum
1406 * (FFh) and clear the flags in the Input() byte.
1407 * Note the descriptor has a bogus 0 byte at the end so we
1408 * only need 1 extra byte.
1409 */
1410 if (*rsize == rsize_orig &&
1411 rdesc[offs] == 0x09 && rdesc[offs + 1] == 0x76) {
1412 __u8 *new_rdesc;
1413
1414 new_rdesc = devm_kzalloc(&hdev->dev, rsize_orig + 1,
1415 GFP_KERNEL);
1416 if (!new_rdesc)
1417 return rdesc;
1418
1419 hid_info(hdev, "Fixing up %s keyb report descriptor\n",
1420 drvdata->quirks & QUIRK_T100CHI ?
1421 "T100CHI" : drvdata->quirks & QUIRK_T90CHI ?
1422 "T90CHI" : "ZENBOOK DUO");
1423
1424 memcpy(new_rdesc, rdesc, rsize_orig);
1425 *rsize = rsize_orig + 1;
1426 rdesc = new_rdesc;
1427
1428 memmove(rdesc + offs + 4, rdesc + offs + 2, 12);
1429 rdesc[offs] = 0x19;
1430 rdesc[offs + 1] = 0x00;
1431 rdesc[offs + 2] = 0x29;
1432 rdesc[offs + 3] = 0xff;
1433 rdesc[offs + 14] = 0x00;
1434 }
1435 }
1436
1437 if (drvdata->quirks & QUIRK_G752_KEYBOARD &&
1438 *rsize == 75 && rdesc[61] == 0x15 && rdesc[62] == 0x00) {
1439 /* report is missing usage minimum and maximum */
1440 __u8 *new_rdesc;
1441 size_t new_size = *rsize + sizeof(asus_g752_fixed_rdesc);
1442
1443 new_rdesc = devm_kzalloc(&hdev->dev, new_size, GFP_KERNEL);
1444 if (new_rdesc == NULL)
1445 return rdesc;
1446
1447 hid_info(hdev, "Fixing up Asus G752 keyb report descriptor\n");
1448 /* copy the valid part */
1449 memcpy(new_rdesc, rdesc, 61);
1450 /* insert missing part */
1451 memcpy(new_rdesc + 61, asus_g752_fixed_rdesc, sizeof(asus_g752_fixed_rdesc));
1452 /* copy remaining data */
1453 memcpy(new_rdesc + 61 + sizeof(asus_g752_fixed_rdesc), rdesc + 61, *rsize - 61);
1454
1455 *rsize = new_size;
1456 rdesc = new_rdesc;
1457 }
1458
1459 if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD &&
1460 *rsize == 331 && rdesc[190] == 0x85 && rdesc[191] == 0x5a &&
1461 rdesc[204] == 0x95 && rdesc[205] == 0x05) {
1462 hid_info(hdev, "Fixing up Asus N-KEY keyb report descriptor\n");
1463 rdesc[205] = 0x01;
1464 }
1465
1466 /* match many more n-key devices */
1467 if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD && *rsize > 15) {
1468 for (int i = 0; i < *rsize - 15; i++) {
1469 /* offset to the count from 0x5a report part always 14 */
1470 if (rdesc[i] == 0x85 && rdesc[i + 1] == 0x5a &&
1471 rdesc[i + 14] == 0x95 && rdesc[i + 15] == 0x05) {
1472 hid_info(hdev, "Fixing up Asus N-Key report descriptor\n");
1473 rdesc[i + 15] = 0x01;
1474 break;
1475 }
1476 }
1477 }
1478
1479 return rdesc;
1480 }
1481
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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