Hello Anand Jain,
The patch 1eea2715ca9b: "btrfs: error out if
btrfs_attach_transaction() fails" from Sep 28, 2017, leads to the
following static checker warning:
fs/btrfs/volumes.c:2502 btrfs_init_new_device()
error: 'trans' dereferencing possible ERR_PTR()
fs/btrfs/volumes.c
2479 ret = btrfs_relocate_sys_chunks(fs_info);
2480 if (ret < 0)
2481 btrfs_handle_fs_error(fs_info, ret,
2482 "Failed to relocate sys chunks
after device initialization. This can be fixed using the \"btrfs balance\"
command.");
2483 trans = btrfs_attach_transaction(root);
2484 if (IS_ERR(trans)) {
2485 if (PTR_ERR(trans) == -ENOENT)
2486 return 0;
2487 ret = PTR_ERR(trans);
2488 goto error_sysfs;
^^^^^^^^^^^^^^^^
We used to have a direct return here.
2489 }
2490 ret = btrfs_commit_transaction(trans);
2491 }
2492
2493 /* Update ctime/mtime for libblkid */
2494 update_dev_time(device_path);
2495 return ret;
2496
2497 error_sysfs:
2498 btrfs_sysfs_rm_device_link(fs_info->fs_devices, device);
2499 error_trans:
2500 if (seeding_dev)
2501 sb->s_flags |= MS_RDONLY;
2502 btrfs_end_transaction(trans);
^^^^^^
But now it's dereferencing an error pointer inside this function.
2503 rcu_string_free(device->name);
2504 kfree(device);
2505 error:
2506 blkdev_put(bdev, FMODE_EXCL);
2507 if (seeding_dev && !unlocked) {
2508 mutex_unlock(&uuid_mutex);
2509 up_write(&sb->s_umount);
2510 }
2511 return ret;
2512 }
regards,
dan carpenter
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