Merge tag 'selinux-pr-20211123' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull SELinux fix from Paul Moore:
 "A fix to make sure things are handled correctly when an allocation
  fails"

* tag 'selinux-pr-20211123' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: fix NULL-pointer dereference when hashtab allocation fails

Author: torvalds

security/selinux/ss/hashtab.c

@@ -31,13 +31,20 @@ static u32 hashtab_compute_size(u32 nel)
 
 int hashtab_init(struct hashtab *h, u32 nel_hint)
 {
-	h->size = hashtab_compute_size(nel_hint);
+	u32 size = hashtab_compute_size(nel_hint);
+
+	/* should already be zeroed, but better be safe */
 	h->nel = 0;
-	if (!h->size)
-		return 0;
+	h->size = 0;
+	h->htable = NULL;
 
-	h->htable = kcalloc(h->size, sizeof(*h->htable), GFP_KERNEL);
-	return h->htable ? 0 : -ENOMEM;
+	if (size) {
+		h->htable = kcalloc(size, sizeof(*h->htable), GFP_KERNEL);
+		if (!h->htable)
+			return -ENOMEM;
+		h->size = size;
+	}
+	return 0;
 }
 
 int __hashtab_insert(struct hashtab *h, struct hashtab_node **dst,