sunrpc: return error if unsupported enctype or cksumtype is encountered

Return an error from gss_import_sec_context_kerberos if the
negotiated context contains encryption or checksum types not
supported by the kernel code.

This fixes an Oops because success was assumed and later code found
no internal_ctx_id.

Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
index 9843eac..60c3dba 100644
--- a/net/sunrpc/auth_gss/gss_krb5_mech.c
+++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -147,13 +147,17 @@
 	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
 	if (IS_ERR(p))
 		goto out_err_free_ctx;
-	if (tmp != SGN_ALG_DES_MAC_MD5)
+	if (tmp != SGN_ALG_DES_MAC_MD5) {
+		p = ERR_PTR(-ENOSYS);
 		goto out_err_free_ctx;
+	}
 	p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
 	if (IS_ERR(p))
 		goto out_err_free_ctx;
-	if (tmp != SEAL_ALG_DES)
+	if (tmp != SEAL_ALG_DES) {
+		p = ERR_PTR(-ENOSYS);
 		goto out_err_free_ctx;
+	}
 	p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
 	if (IS_ERR(p))
 		goto out_err_free_ctx;
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
index 1c6eda5..dedcbd6 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -83,6 +83,7 @@
 	u32			seq_send;
 
 	dprintk("RPC:       gss_krb5_seal\n");
+	BUG_ON(ctx == NULL);
 
 	now = get_seconds();