CC: kbuild-...@lists.01.org In-Reply-To: <20210122162529.84978-13-alexandru.ardel...@analog.com> References: <20210122162529.84978-13-alexandru.ardel...@analog.com> TO: Alexandru Ardelean <alexandru.ardel...@analog.com> TO: linux-ker...@vger.kernel.org TO: linux-...@vger.kernel.org CC: l...@metafoo.de CC: michael.henner...@analog.com CC: ji...@kernel.org CC: nuno...@analog.com CC: dragos.bog...@analog.com CC: Alexandru Ardelean <alexandru.ardel...@analog.com>
Hi Alexandru, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on linux/master linus/master v5.11-rc5 next-20210122] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Alexandru-Ardelean/iio-core-buffer-add-support-for-multiple-IIO-buffers-per-IIO-device/20210125-053419 base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg :::::: branch date: 11 hours ago :::::: commit date: 11 hours ago config: i386-randconfig-m021-20210125 (attached as .config) compiler: gcc-9 (Debian 9.3.0-20) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <l...@intel.com> Reported-by: Dan Carpenter <dan.carpen...@oracle.com> New smatch warnings: drivers/iio/industrialio-buffer.c:1451 iio_device_buffer_getfd() warn: potential spectre issue 'iio_dev_opaque->attached_buffers' [r] (local cap) drivers/iio/industrialio-buffer.c:1453 iio_device_buffer_getfd() warn: possible spectre second half. 'buffer' Old smatch warnings: drivers/iio/industrialio-buffer.c:1721 iio_buffer_alloc_sysfs_and_mask() error: uninitialized symbol 'cnt'. vim +1451 drivers/iio/industrialio-buffer.c 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1424 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1425 static long iio_device_buffer_getfd(struct iio_dev *indio_dev, unsigned long arg) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1426 { 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1427 struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1428 int __user *ival = (int __user *)arg; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1429 char buf_name[sizeof("iio:buffer:xxx")]; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1430 struct iio_dev_buffer_pair *ib; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1431 struct iio_buffer *buffer; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1432 int fd, idx; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1433 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1434 if (copy_from_user(&idx, ival, sizeof(idx))) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1435 return -EFAULT; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1436 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1437 if (idx == 0) { 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1438 fd = 0; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1439 if (copy_to_user(ival, &fd, sizeof(fd))) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1440 return -EFAULT; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1441 return 0; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1442 } 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1443 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1444 if (idx >= iio_dev_opaque->attached_buffers_cnt) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1445 return -ENOENT; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1446 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1447 fd = mutex_lock_interruptible(&indio_dev->mlock); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1448 if (fd) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1449 return fd; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1450 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 @1451 buffer = iio_dev_opaque->attached_buffers[idx]; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1452 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 @1453 if (test_and_set_bit(IIO_BUSY_BIT_POS, &buffer->flags)) { 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1454 fd = -EBUSY; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1455 goto error_unlock; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1456 } 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1457 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1458 iio_device_get(indio_dev); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1459 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1460 ib = kzalloc(sizeof(*ib), GFP_KERNEL); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1461 if (!ib) { 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1462 fd = -ENOMEM; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1463 goto error_iio_dev_put; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1464 } 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1465 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1466 ib->indio_dev = indio_dev; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1467 ib->buffer = buffer; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1468 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1469 fd = anon_inode_getfd(buf_name, &iio_buffer_chrdev_fileops, 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1470 ib, O_RDWR | O_CLOEXEC); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1471 if (fd < 0) 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1472 goto error_free_ib; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1473 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1474 if (copy_to_user(ival, &fd, sizeof(fd))) { 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1475 fd = -EFAULT; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1476 goto error_free_ib; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1477 } 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1478 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1479 mutex_unlock(&indio_dev->mlock); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1480 return fd; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1481 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1482 error_free_ib: 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1483 kfree(ib); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1484 error_iio_dev_put: 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1485 iio_device_put(indio_dev); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1486 clear_bit(IIO_BUSY_BIT_POS, &buffer->flags); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1487 error_unlock: 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1488 mutex_unlock(&indio_dev->mlock); 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1489 return fd; 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1490 } 2bcbc1e1334fb555 Alexandru Ardelean 2021-01-22 1491 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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