X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=fs%2Fposix_acl.c;h=3542f1f814e2a966d33429f61e9f78ab5404a18c;hb=c73df6f73c8167b9ed68d653d1a5c761c209d2b5;hp=8bd2135b7f82ce181445f8e4804d4b226dca4891;hpb=f38787f4f921222d080d976ef59210ce3c6c6cb4;p=firefly-linux-kernel-4.4.55.git

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 8bd2135b7f82..3542f1f814e2 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -158,6 +158,12 @@ 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: