From: Pavel Skripkin <paskripkin@gmail.com>
Date: Fri, 25 Jun 2021 20:23:48 +0000 (+0300)
Subject: net: sched: fix warning in tcindex_alloc_perfect_hash
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3f2db250099f46988088800052cdf2332c7aba61;p=linux.git

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: b9a24bb76bf6 ("net_sched: properly handle failure case of tcf_exts_init()")
Reported-and-tested-by: syzbot+1071ad60cd7df39fdadb@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Acked-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index c4007b9cd16d6..5b274534264c2 100644
--- a/net/sched/cls_tcindex.c
+++ b/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;