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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2012-08-15 23:31:45 +0400 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-08-15 21:37:09 +0200 |
| commit | bcb4a75bde3821cecb17a71d287abfd6ef9bd68d (patch) | |
| tree | ac7c344f803ee7ce31f04ffb94ca133a02ea59eb | |
| parent | 2843b673d03421e0e73cf061820d1db328f7c8eb (diff) | |
| download | linux-bcb4a75bde3821cecb17a71d287abfd6ef9bd68d.tar.bz2 | |
HID: hidraw: improve error handling in hidraw_init()
Several improvements in error handling:
- do not report success if alloc_chrdev_region() failed
- check for error code of cdev_add()
- use unregister_chrdev_region() instead of unregister_chrdev()
if class_create() failed
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
| -rw-r--r-- | drivers/hid/hidraw.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 3b6f7bf5a77e..7c47fc3f7b2b 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -559,21 +559,28 @@ int __init hidraw_init(void) if (result < 0) { pr_warn("can't get major number\n"); - result = 0; goto out; } hidraw_class = class_create(THIS_MODULE, "hidraw"); if (IS_ERR(hidraw_class)) { result = PTR_ERR(hidraw_class); - unregister_chrdev(hidraw_major, "hidraw"); - goto out; + goto error_cdev; } cdev_init(&hidraw_cdev, &hidraw_ops); - cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); + result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); + if (result < 0) + goto error_class; + out: return result; + +error_class: + class_destroy(hidraw_class); +error_cdev: + unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); + goto out; } void hidraw_exit(void) |