diff options
| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2014-12-20 00:51:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-17 15:04:12 -0800 |
| commit | d7312aab230f975b8ec41c0055a17f0d395b7fb5 (patch) | |
| tree | 2e4c7d06f5288ebf45a426af696001bcc74e7514 /drivers/staging/dgnc | |
| parent | 1cf3273dfbd7918fd43e0c70c65795a89f8e88d7 (diff) | |
staging: dgnc: implement proper error handling in dgnc_start()
dgnc_start() ignores errors in class_create() and device_create()
and it does not deallocate resources if dgnc_tty_preinit() fails.
The patch implements proper error handling.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/dgnc')
| -rw-r--r-- | drivers/staging/dgnc/dgnc_driver.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/staging/dgnc/dgnc_driver.c b/drivers/staging/dgnc/dgnc_driver.c index ba98ff348112..f610ae1f3a9f 100644 --- a/drivers/staging/dgnc/dgnc_driver.c +++ b/drivers/staging/dgnc/dgnc_driver.c @@ -238,6 +238,7 @@ static int dgnc_start(void) { int rc = 0; unsigned long flags; + struct device *dev; /* make sure that the globals are init'd before we do anything else */ dgnc_init_globals(); @@ -257,9 +258,20 @@ static int dgnc_start(void) dgnc_Major = rc; dgnc_class = class_create(THIS_MODULE, "dgnc_mgmt"); - device_create(dgnc_class, NULL, - MKDEV(dgnc_Major, 0), - NULL, "dgnc_mgmt"); + if (IS_ERR(dgnc_class)) { + rc = PTR_ERR(dgnc_class); + pr_err(DRVSTR ": Can't create dgnc_mgmt class (%d)\n", rc); + goto failed_class; + } + + dev = device_create(dgnc_class, NULL, + MKDEV(dgnc_Major, 0), + NULL, "dgnc_mgmt"); + if (IS_ERR(dev)) { + rc = PTR_ERR(dev); + pr_err(DRVSTR ": Can't create device (%d)\n", rc); + goto failed_device; + } /* * Init any global tty stuff. @@ -268,7 +280,7 @@ static int dgnc_start(void) if (rc < 0) { pr_err(DRVSTR ": tty preinit - not enough memory (%d)\n", rc); - return rc; + goto failed_tty; } /* Start the poller */ @@ -282,6 +294,14 @@ static int dgnc_start(void) add_timer(&dgnc_poll_timer); + return 0; + +failed_tty: + device_destroy(dgnc_class, MKDEV(dgnc_Major, 0)); +failed_device: + class_destroy(dgnc_class); +failed_class: + unregister_chrdev(dgnc_Major, "dgnc"); return rc; } |