net: sched: fix warning in tcindex_alloc_perfect_hash

Syzbot reported warning in tcindex_alloc_perfect_hash. The problem
was in too big cp->hash, which triggers warning in kmalloc. Since
cp->hash comes from userspace, there is no need to warn if value
is not correct

Fixes: b9a24bb ("net_sched: properly handle failure case of tcf_exts_init()")
Reported-and-tested-by: [email protected]
Signed-off-by: Pavel Skripkin <[email protected]>
Acked-by: Cong Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: pskrgag

net/sched/cls_tcindex.c

@@ -304,7 +304,7 @@ static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp)
 	int i, err = 0;
 
 	cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
-			      GFP_KERNEL);
+			      GFP_KERNEL | __GFP_NOWARN);
 	if (!cp->perfect)
 		return -ENOMEM;