netfilter: conntrack: avoid integer overflow when resizing
[cascardo/linux.git] / net / netfilter / nf_conntrack_core.c
index f204274..62c42e9 100644 (file)
@@ -1601,8 +1601,15 @@ void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls)
        unsigned int nr_slots, i;
        size_t sz;
 
+       if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head)))
+               return NULL;
+
        BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head));
        nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head));
+
+       if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head)))
+               return NULL;
+
        sz = nr_slots * sizeof(struct hlist_nulls_head);
        hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO,
                                        get_order(sz));