netfilter: nf_tables: Fix oversized kvmalloc() calls

The commit 7376f3330a82 ("mm: don't allow oversized kvmalloc() calls")
limits the max allocatable memory via kvmalloc() to MAX_INT.

Reported-by: syzbot+cd43695a64bcd21b8596@syzkaller.appspotmail.com
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 33e771cd847c3279d2552634b0f3026522ce36a1..b9546defdc2805ba88dd5c0a0190cd03c1b5e58b 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4336,7 +4336,7 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
        if (ops->privsize != NULL)
                size = ops->privsize(nla, &desc);
        alloc_size = sizeof(*set) + size + udlen;
-       if (alloc_size < size)
+       if (alloc_size < size || alloc_size > INT_MAX)
                return -ENOMEM;
        set = kvzalloc(alloc_size, GFP_KERNEL);
        if (!set)