commit c47205914cf5a8cf564ca560aa6eaa2287867e58
author J. Bruce Fields <bfields@redhat.com> Wed Aug 07 11:41:49 2013 -0400
committer J. Bruce Fields <bfields@redhat.com> Wed Aug 07 12:05:51 2013 -0400
tree fab725d3eea67979da88221642fca0cb91d34412
parent 7193bd17ea92c4c89016c304362c9be93ce50050

nfsd4: Fix MACH_CRED NULL dereference

Fixes a NULL-dereference on attempts to use MACH_CRED protection over
auth_sys.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4state.c

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 280acef..43f4229 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1264,6 +1264,8 @@
 	struct svc_cred *cr = &rqstp->rq_cred;
 	u32 service;
 
+	if (!cr->cr_gss_mech)
+		return false;
 	service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
 	return service == RPC_GSS_SVC_INTEGRITY ||
 	       service == RPC_GSS_SVC_PRIVACY;