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Subject[PATCH 4.4 37/91] net_sched: keep alloc_hash updated after hash allocation
Date
From: Cong Wang <xiyou.wangcong@gmail.com>

[ Upstream commit 0d1c3530e1bd38382edef72591b78e877e0edcd3 ]

In commit 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
I moved cp->hash calculation before the first
tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched.
This difference could lead to another out of bound access.

cp->alloc_hash should always be the size allocated, we should
update it after this tcindex_alloc_perfect_hash().

Reported-and-tested-by: syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com
Reported-and-tested-by: syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com
Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sched/cls_tcindex.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -293,6 +293,7 @@ tcindex_set_parms(struct net *net, struc
sizeof(*r) * cp->hash, GFP_KERNEL);
if (!cp->perfect)
goto errout;
+ cp->alloc_hash = cp->hash;
for (i = 0; i < min(cp->hash, p->hash); i++)
tcf_exts_init(&cp->perfect[i].exts,
TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);

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