NFSD: Add a separate decoder for ssv_sp_parms

[ Upstream commit 547bfeb4cd8d491aabbd656d5a6f410cb4249b4e ]

Refactor for clarity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 15535b14328e467fd08fcab2077ddbdb51013daa..8c5701367e4afea14f021661b30db38eccf2f8e3 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1488,12 +1488,54 @@ nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
        return nfs_ok;
 }
 
+/*
+ * This implementation currently does not support SP4_SSV.
+ * This decoder simply skips over these arguments.
+ */
+static noinline __be32
+nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
+                         struct nfsd4_exchange_id *exid)
+{
+       u32 count, window, num_gss_handles;
+       __be32 status;
+
+       /* ssp_ops */
+       status = nfsd4_decode_state_protect_ops(argp, exid);
+       if (status)
+               return status;
+
+       /* ssp_hash_algs<> */
+       if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
+               return nfserr_bad_xdr;
+       while (count--) {
+               status = nfsd4_decode_ignored_string(argp, 0);
+               if (status)
+                       return status;
+       }
+
+       /* ssp_encr_algs<> */
+       if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
+               return nfserr_bad_xdr;
+       while (count--) {
+               status = nfsd4_decode_ignored_string(argp, 0);
+               if (status)
+                       return status;
+       }
+
+       if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
+               return nfserr_bad_xdr;
+       if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
+               return nfserr_bad_xdr;
+
+       return nfs_ok;
+}
+
 static __be32
 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
                         struct nfsd4_exchange_id *exid)
 {
-       int dummy, tmp;
        DECODE_HEAD;
+       int dummy;
 
        READ_BUF(NFS4_VERIFIER_SIZE);
        COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
@@ -1517,33 +1559,9 @@ nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
                        return status;
                break;
        case SP4_SSV:
-               /* ssp_ops */
-               status = nfsd4_decode_state_protect_ops(argp, exid);
+               status = nfsd4_decode_ssv_sp_parms(argp, exid);
                if (status)
                        return status;
-
-               /* ssp_hash_algs<> */
-               READ_BUF(4);
-               tmp = be32_to_cpup(p++);
-               while (tmp--) {
-                       READ_BUF(4);
-                       dummy = be32_to_cpup(p++);
-                       READ_BUF(dummy);
-                       p += XDR_QUADLEN(dummy);
-               }
-
-               /* ssp_encr_algs<> */
-               READ_BUF(4);
-               tmp = be32_to_cpup(p++);
-               while (tmp--) {
-                       READ_BUF(4);
-                       dummy = be32_to_cpup(p++);
-                       READ_BUF(dummy);
-                       p += XDR_QUADLEN(dummy);
-               }
-
-               /* ignore ssp_window and ssp_num_gss_handles: */
-               READ_BUF(8);
                break;
        default:
                goto xdr_error;