loopdev: remove an user triggerable oops

When loopdev is built as module and we pass an invalid parameter,
loop_init() will return directly without deregister misc device, which
will cause an oops when insert loop module next time because we left some
garbage in the misc device list.

Test case:
sudo modprobe loop max_part=1024
(failed due to invalid parameter)
sudo modprobe loop
(oops)

Clean up nicely to avoid such oops.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Guo Chao <yan@linux.vnet.ibm.com>
Cc: M. Hindess <hindessm@uk.ibm.com>
Cc: Nikanth Karthikesan <knikanth@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 16 insertions, 6 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 6579f69fd7a4..1b1b0c981a85 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1844,11 +1844,15 @@ static int __init loop_init(void)
                 max_part = (1UL << part_shift) - 1;
         }
 
-        if ((1UL << part_shift) > DISK_MAX_PARTS)
-                return -EINVAL;
+        if ((1UL << part_shift) > DISK_MAX_PARTS) {
+                err = -EINVAL;
+                goto misc_out;
+        }
 
-        if (max_loop > 1UL << (MINORBITS - part_shift))
-                return -EINVAL;
+        if (max_loop > 1UL << (MINORBITS - part_shift)) {
+                err = -EINVAL;
+                goto misc_out;
+        }
 
         /*
          * If max_loop is specified, create that many devices upfront.
@@ -1866,8 +1870,10 @@ static int __init loop_init(void)
                 range = 1UL << MINORBITS;
         }
 
-        if (register_blkdev(LOOP_MAJOR, "loop"))
-                return -EIO;
+        if (register_blkdev(LOOP_MAJOR, "loop")) {
+                err = -EIO;
+                goto misc_out;
+        }
 
         blk_register_region(MKDEV(LOOP_MAJOR, 0), range,
                                   THIS_MODULE, loop_probe, NULL, NULL);
@@ -1880,6 +1886,10 @@ static int __init loop_init(void)
 
         printk(KERN_INFO "loop: module loaded\n");
         return 0;
+
+misc_out:
+        misc_deregister(&loop_misc);
+        return err;
 }
 
 static int loop_exit_cb(int id, void *ptr, void *data)