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net: sched: fix warning in tcindex_alloc_perfect_hash

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[ Upstream commit 3f2db250099f46988088800052cdf2332c7aba61 ]

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: b9a24bb76b ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Skripkin
2021-06-25 23:23:48 +03:00
committed by Greg Kroah-Hartman
parent 4476568069
commit 1148952dc6
1 changed files with 1 additions and 1 deletions
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2
net/sched/cls_tcindex.c
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@@ -304,7 +304,7 @@ static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp)
int i, err = 0; int i, err = 0;
cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result), cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
GFP_KERNEL); GFP_KERNEL | __GFP_NOWARN);
if (!cp->perfect) if (!cp->perfect)
return -ENOMEM; return -ENOMEM;