selinux: fix NULL-pointer dereference when hashtab allocation fails

When the hash table slot array allocation fails in hashtab_init(),
h->size is left initialized with a non-zero value, but the h->htable
pointer is NULL. This may then cause a NULL pointer dereference, since
the policydb code relies on the assumption that even after a failed
hashtab_init(), hashtab_map() and hashtab_destroy() can be safely called
on it. Yet, these detect an empty hashtab only by looking at the size.

Fix this by making sure that hashtab_init() always leaves behind a valid
empty hashtab when the allocation fails.

Cc: stable@vger.kernel.org
Fixes: 03414a49ad5f ("selinux: do not allocate hashtabs dynamically")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/security/selinux/ss/hashtab.c b/security/selinux/ss/hashtab.c
index 727c3b4..0ae4e4e 100644 (file)
--- a/security/selinux/ss/hashtab.c
+++ b/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,