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