From: J. Bruce Fields <bfields@redhat.com>
Date: Wed, 7 Aug 2013 15:41:49 +0000 (-0400)
Subject: nfsd4: Fix MACH_CRED NULL dereference
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=c47205914cf5a8cf564ca560aa6eaa2287867e58;p=deliverable%2Flinux.git

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>
---

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 280acef6f0dc..43f42290e5df 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1264,6 +1264,8 @@ static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
 	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;