nbd: fix memory leak of nbd_dev array

We leak the memory allocated for the nbd_dev array at multiple places.
Fix them by either adding a kfree() or by rearranging code to return
before we allocate the memory.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Cc: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index ad98dda..1778e4a 100644 (file)
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -707,15 +707,15 @@ static int __init nbd_init(void)
 
        BUILD_BUG_ON(sizeof(struct nbd_request) != 28);
 
-       nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL);
-       if (!nbd_dev)
-               return -ENOMEM;
-
        if (max_part < 0) {
                printk(KERN_CRIT "nbd: max_part must be >= 0\n");
                return -EINVAL;
        }
 
+       nbd_dev = kcalloc(nbds_max, sizeof(*nbd_dev), GFP_KERNEL);
+       if (!nbd_dev)
+               return -ENOMEM;
+
        part_shift = 0;
        if (max_part > 0)
                part_shift = fls(max_part);
@@ -779,6 +779,7 @@ out:
                blk_cleanup_queue(nbd_dev[i].disk->queue);
                put_disk(nbd_dev[i].disk);
        }
+       kfree(nbd_dev);
        return err;
 }
 
@@ -795,6 +796,7 @@ static void __exit nbd_cleanup(void)
                }
        }
        unregister_blkdev(NBD_MAJOR, "nbd");
+       kfree(nbd_dev);
        printk(KERN_INFO "nbd: unregistered device at major %d\n", NBD_MAJOR);
 }