locks: fix leak on merging leases

We must also free the passed-in lease in the case it wasn't used because
an existing lease was upgrade/downgraded or already existed.

Note the nfsd caller doesn't care because it's fl_change callback
returns an error in those cases.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/locks.c b/fs/locks.c
index 65765cb6afedaee442c1e1ab21bf7269ce9b07c7..61c22f722050e1992db7067c97088c4452a7bbc0 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1504,7 +1504,7 @@ static int do_fcntl_delete_lease(struct file *filp)
 
 static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
 {
-       struct file_lock *fl;
+       struct file_lock *fl, *ret;
        struct fasync_struct *new;
        struct inode *inode = filp->f_path.dentry->d_inode;
        int error;
@@ -1518,6 +1518,7 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
                locks_free_lock(fl);
                return -ENOMEM;
        }
+       ret = fl;
        lock_flocks();
        error = __vfs_setlease(filp, arg, &fl);
        if (error) {
@@ -1525,6 +1526,8 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
                locks_free_lock(fl);
                goto out_free_fasync;
        }
+       if (ret != fl)
+               locks_free_lock(fl);
 
        /*
         * fasync_insert_entry() returns the old entry if any.
@@ -1532,7 +1535,7 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
         * inserted it into the fasync list. Clear new so that
         * we don't release it here.
         */
-       if (!fasync_insert_entry(fd, filp, &fl->fl_fasync, new))
+       if (!fasync_insert_entry(fd, filp, &ret->fl_fasync, new))
                new = NULL;
 
        if (error < 0) {