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Message-Id: <20180407015452.26636-1-xiyou.wangcong@gmail.com>
Date: Fri, 6 Apr 2018 18:54:52 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: Cong Wang <xiyou.wangcong@...il.com>,
GhantaKrishnamurthy MohanKrishna
<mohan.krishna.ghanta.krishnamurthy@...csson.com>,
Jon Maloy <jon.maloy@...csson.com>,
Ying Xue <ying.xue@...driver.com>
Subject: [Patch net] tipc: use the right skb in tipc_sk_fill_sock_diag()
Commit 4b2e6877b879 ("tipc: Fix namespace violation in tipc_sk_fill_sock_diag")
tried to fix the crash but failed, the crash is still 100% reproducible
with it.
In tipc_sk_fill_sock_diag(), skb is the diag dump we are filling, it is not
correct to retrieve its NETLINK_CB(), instead, like other protocol diag,
we should use NETLINK_CB(cb->skb).sk here.
Reported-by: <syzbot+326e587eff1074657718@...kaller.appspotmail.com>
Fixes: 4b2e6877b879 ("tipc: Fix namespace violation in tipc_sk_fill_sock_diag")
Fixes: c30b70deb5f4 (tipc: implement socket diagnostics for AF_TIPC)
Cc: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@...csson.com>
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Ying Xue <ying.xue@...driver.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
net/tipc/diag.c | 2 +-
net/tipc/socket.c | 6 +++---
net/tipc/socket.h | 4 ++--
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/net/tipc/diag.c b/net/tipc/diag.c
index 46d9cd62f781..aaabb0b776dd 100644
--- a/net/tipc/diag.c
+++ b/net/tipc/diag.c
@@ -59,7 +59,7 @@ static int __tipc_add_sock_diag(struct sk_buff *skb,
if (!nlh)
return -EMSGSIZE;
- err = tipc_sk_fill_sock_diag(skb, tsk, req->tidiag_states,
+ err = tipc_sk_fill_sock_diag(skb, cb, tsk, req->tidiag_states,
__tipc_diag_gen_cookie);
if (err)
return err;
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index cee6674a3bf4..1fd1c8b5ce03 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -3257,8 +3257,8 @@ int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
}
EXPORT_SYMBOL(tipc_nl_sk_walk);
-int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct tipc_sock *tsk,
- u32 sk_filter_state,
+int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
+ struct tipc_sock *tsk, u32 sk_filter_state,
u64 (*tipc_diag_gen_cookie)(struct sock *sk))
{
struct sock *sk = &tsk->sk;
@@ -3280,7 +3280,7 @@ int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct tipc_sock *tsk,
nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
nla_put_u32(skb, TIPC_NLA_SOCK_UID,
- from_kuid_munged(sk_user_ns(NETLINK_CB(skb).sk),
+ from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
sock_i_uid(sk))) ||
nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
tipc_diag_gen_cookie(sk),
diff --git a/net/tipc/socket.h b/net/tipc/socket.h
index aae3fd4cd06c..aff9b2ae5a1f 100644
--- a/net/tipc/socket.h
+++ b/net/tipc/socket.h
@@ -61,8 +61,8 @@ int tipc_sk_rht_init(struct net *net);
void tipc_sk_rht_destroy(struct net *net);
int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb);
int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb);
-int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct tipc_sock *tsk,
- u32 sk_filter_state,
+int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
+ struct tipc_sock *tsk, u32 sk_filter_state,
u64 (*tipc_diag_gen_cookie)(struct sock *sk));
int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
int (*skb_handler)(struct sk_buff *skb,
--
2.13.0
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