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>
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 13619d2..646d4d8 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -401,12 +401,12 @@
*/
static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *resp)
{
- struct cb_compound_hdr_arg hdr_arg;
- struct cb_compound_hdr_res hdr_res;
+ struct cb_compound_hdr_arg hdr_arg = { 0 };
+ struct cb_compound_hdr_res hdr_res = { NULL };
struct xdr_stream xdr_in, xdr_out;
__be32 *p;
__be32 status;
- unsigned int nops = 1;
+ unsigned int nops = 0;
dprintk("%s: start\n", __FUNCTION__);
@@ -415,20 +415,20 @@
p = (__be32*)((char *)rqstp->rq_res.head[0].iov_base + rqstp->rq_res.head[0].iov_len);
xdr_init_encode(&xdr_out, &rqstp->rq_res, p);
- decode_compound_hdr_arg(&xdr_in, &hdr_arg);
+ status = decode_compound_hdr_arg(&xdr_in, &hdr_arg);
+ if (status == __constant_htonl(NFS4ERR_RESOURCE))
+ return rpc_garbage_args;
+
hdr_res.taglen = hdr_arg.taglen;
hdr_res.tag = hdr_arg.tag;
- hdr_res.nops = NULL;
- encode_compound_hdr_res(&xdr_out, &hdr_res);
+ if (encode_compound_hdr_res(&xdr_out, &hdr_res) != 0)
+ return rpc_system_err;
- for (;;) {
+ while (status == 0 && nops != hdr_arg.nops) {
status = process_op(rqstp, &xdr_in, argp, &xdr_out, resp);
- if (status != 0)
- break;
- if (nops == hdr_arg.nops)
- break;
nops++;
}
+
*hdr_res.status = status;
*hdr_res.nops = htonl(nops);
dprintk("%s: done, status = %u\n", __FUNCTION__, ntohl(status));