[PATCH 5.9 145/255] NFSD: fix missing refcount in nfsd4_copy by nfsd4_do_async_copy

[Greg Kroah-Hartman]

From: Dai Ngo <dai....@oracle.com>

[ Upstream commit 49a361327332c9221438397059067f9b205f690d ]

Need to initialize nfsd4_copy's refcount to 1 to avoid use-after-free
warning when nfs4_put_copy is called from nfsd4_cb_offload_release.

Fixes: ce0887ac96d3 ("NFSD add nfs4 inter ssc to nfsd4_copy")
Signed-off-by: Dai Ngo <dai....@oracle.com>
Signed-off-by: J. Bruce Fields <bfie...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 fs/nfsd/nfs4proc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 80effaa18b7b2..3ba17b5fc9286 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1486,6 +1486,7 @@ do_callback:
        cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL);
        if (!cb_copy)
                goto out;
+       refcount_set(&cb_copy->refcount, 1);
        memcpy(&cb_copy->cp_res, &copy->cp_res, sizeof(copy->cp_res));
        cb_copy->cp_clp = copy->cp_clp;
        cb_copy->nfserr = copy->nfserr;
-- 
2.27.0