nfsd: fix potential lease memory leak in nfs4_setlease

It's unlikely to ever occur, but if there were already a lease set on
the file then we could end up getting back a different pointer on a
successful setlease attempt than the one we allocated. If that happens,
the one we allocated could leak.

In practice, I don't think this will happen due to the fact that we only
try to set up the lease once per nfs4_file, but this error handling is a
bit more correct given the current lease API.

Cc: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a91e521..5bb4952 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3781,7 +3781,7 @@ static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
 static int nfs4_setlease(struct nfs4_delegation *dp)
 {
        struct nfs4_file *fp = dp->dl_stid.sc_file;
-       struct file_lock *fl;
+       struct file_lock *fl, *ret;
        struct file *filp;
        int status = 0;
 
@@ -3795,11 +3795,14 @@ static int nfs4_setlease(struct nfs4_delegation *dp)
                return -EBADF;
        }
        fl->fl_file = filp;
-       status = vfs_setlease(filp, fl->fl_type, &fl);
+       ret = fl;
+       status = vfs_setlease(filp, fl->fl_type, &ret);
        if (status) {
                locks_free_lock(fl);
                goto out_fput;
        }
+       if (ret != fl)
+               locks_free_lock(fl);
        spin_lock(&state_lock);
        spin_lock(&fp->fi_lock);
        /* Did the lease get broken before we took the lock? */