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nfsd: Fixes for nfsd4_encode_read_plus_data()

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[ Upstream commit 72d78717c6d06adf65d2e3dccc96d9e9dc978593 ]

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

Fixes: 528b84934e ("NFSD: Add READ_PLUS data support")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2020-12-11 12:26:14 -05:00 committed by Greg Kroah-Hartman
parent 8478091a1b
commit de82ec8e5e
1 changed files with 5 additions and 0 deletions
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5
fs/nfsd/nfs4xdr.c
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@ -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;
}