fbdev: fbmem: implement error handling in fbmem_init()
fbmem_init() ignores all errors, while fbmem_exit() does not
check if deallocating resources are valid.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 4e73b6f..76c1ad9 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1854,17 +1854,31 @@
static int __init
fbmem_init(void)
{
- proc_create("fb", 0, NULL, &fb_proc_fops);
+ int ret;
- if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
+ if (!proc_create("fb", 0, NULL, &fb_proc_fops))
+ return -ENOMEM;
+
+ ret = register_chrdev(FB_MAJOR, "fb", &fb_fops);
+ if (ret) {
printk("unable to get major %d for fb devs\n", FB_MAJOR);
+ goto err_chrdev;
+ }
fb_class = class_create(THIS_MODULE, "graphics");
if (IS_ERR(fb_class)) {
- printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
+ ret = PTR_ERR(fb_class);
+ pr_warn("Unable to create fb class; errno = %d\n", ret);
fb_class = NULL;
+ goto err_class;
}
return 0;
+
+err_class:
+ unregister_chrdev(FB_MAJOR, "fb");
+err_chrdev:
+ remove_proc_entry("fb", NULL);
+ return ret;
}
#ifdef MODULE