[PATCH 5.10 076/199] nfsd: Fixes for nfsd4_encode_read_plus_data()

[Greg Kroah-Hartman]

From: Trond Myklebust <trond.mykleb...@hammerspace.com>

[ Upstream commit 72d78717c6d06adf65d2e3dccc96d9e9dc978593 ]

Ensure that we encode the data payload + padding, and that we truncate
the preallocated buffer to the actual read size.

Fixes: 528b84934eb9 ("NFSD: Add READ_PLUS data support")
Signed-off-by: Trond Myklebust <trond.mykleb...@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.le...@oracle.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 fs/nfsd/nfs4xdr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 833a2c64dfe80..26f6e277101de 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4632,6 +4632,7 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres 
*resp,
                            resp->rqstp->rq_vec, read->rd_vlen, maxcount, eof);
        if (nfserr)
                return nfserr;
+       xdr_truncate_encode(xdr, starting_len + 16 + xdr_align_size(*maxcount));
 
        tmp = htonl(NFS4_CONTENT_DATA);
        write_bytes_to_xdr_buf(xdr->buf, starting_len,      &tmp,   4);
@@ -4639,6 +4640,10 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres 
*resp,
        write_bytes_to_xdr_buf(xdr->buf, starting_len + 4,  &tmp64, 8);
        tmp = htonl(*maxcount);
        write_bytes_to_xdr_buf(xdr->buf, starting_len + 12, &tmp,   4);
+
+       tmp = xdr_zero;
+       write_bytes_to_xdr_buf(xdr->buf, starting_len + 16 + *maxcount, &tmp,
+                              xdr_pad_size(*maxcount));
        return nfs_ok;
 }
 
-- 
2.27.0