NFSv4: Check the return value of decode_compound_hdr_arg()
If decode_compound_hdr_arg() returns a resource error, then we cannot proceed to process the callback. Return a 'GARBAGE_ARGS' rpc-level error to the caller instead. If, however, the minor version field is incorrect, then we need to propagate the resulting NFS4ERR_MINOR_VERS_MISMATCH error back as the compound status field (setting the nops field to 0). Finally, if encode_compound_hdr_res() returns an error, we need to return an RPC_SYSTEM_ERR to the caller. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -401,12 +401,12 @@ static __be32 process_op(struct svc_rqst *rqstp,
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*/
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static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
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{
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struct cb_compound_hdr_arg hdr_arg;
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struct cb_compound_hdr_res hdr_res;
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struct cb_compound_hdr_arg hdr_arg = { 0 };
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struct cb_compound_hdr_res hdr_res = { NULL };
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struct xdr_stream xdr_in, xdr_out;
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__be32 *p;
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__be32 status;
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unsigned int nops = 1;
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unsigned int nops = 0;
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dprintk("%s: start\n", __FUNCTION__);
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@ -415,20 +415,20 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
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p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
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xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
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decode_compound_hdr_arg(&xdr_in, &hdr_arg);
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status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
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if (status == __constant_htonl(NFS4ERR_RESOURCE))
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return rpc_garbage_args;
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hdr_res.taglen = hdr_arg.taglen;
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hdr_res.tag = hdr_arg.tag;
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hdr_res.nops = NULL;
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encode_compound_hdr_res(&xdr_out, &hdr_res);
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if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
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return rpc_system_err;
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for (;;) {
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while (status == 0 && nops != hdr_arg.nops) {
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status = process_op(rqstp, &xdr_in, argp, &xdr_out, resp);
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if (status != 0)
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break;
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if (nops == hdr_arg.nops)
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break;
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nops++;
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}
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*hdr_res.status = status;
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*hdr_res.nops = htonl(nops);
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dprintk("%s: done, status = %u\n", __FUNCTION__, ntohl(status));
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