X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fposix_acl.c;h=0855f772cd41599d6c1d1091e7da616d32cccf53;hb=8ff1e6705a4c711247708f23881feea169e6fc3c;hp=9e363e41dacc8c2ebc007661a598c01e84da45c9;hpb=0a7418f5f569512e98789c439198eed4b507cce3;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 9e363e41dacc..0855f772cd41 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -246,6 +246,12 @@ posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p)
 	umode_t mode = 0;
 	int not_equiv = 0;
 
+	/*
+	 * A null ACL can always be presented as mode bits.
+	 */
+	if (!acl)
+		return 0;
+
 	FOREACH_ACL_ENTRY(pa, acl, pe) {
 		switch (pa->e_tag) {
 			case ACL_USER_OBJ: