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Subject[PATCH 1/1] ipv4: fix NULL pointer dereference in __inet_put_port()
Date
There may be race condition when accessing inet_csk(sk)->icsk_bind_hash,
which leads to a crash like this:

Unable to handle kernel NULL pointer dereference at virtual
address 00000010
......
[<ffffffc000929140>] inet_put_port+0x80/0xb8
[<ffffffc00092c4bc>] tcp_set_state+0xc4/0x110
[<ffffffc00092ce68>] tcp_done+0x60/0xb8
[<ffffffc000930718>] tcp_nuke_addr+0x22c/0x2a0
[<ffffffc000950558>] devinet_ioctl+0x294/0x680
[<ffffffc000951e68>] inet_ioctl+0xd4/0x100
[<ffffffc00089fd04>] sock_do_ioctl+0x40/0x70
[<ffffffc0008a0238>] sock_ioctl+0x288/0x2a8
[<ffffffc000193358>] do_vfs_ioctl+0x4b4/0x588
[<ffffffc000193494>] SyS_ioctl+0x68/0x94
......

Signed-off-by: fanhui <fanhui00@gmail.com>
---
net/ipv4/inet_hashtables.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index bc68ece..742c618 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -112,11 +112,14 @@ static void __inet_put_port(struct sock *sk)

spin_lock(&head->lock);
tb = inet_csk(sk)->icsk_bind_hash;
+ if (!tb)
+ goto out;
__sk_del_bind_node(sk);
tb->num_owners--;
inet_csk(sk)->icsk_bind_hash = NULL;
inet_sk(sk)->inet_num = 0;
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
+out:
spin_unlock(&head->lock);
}

--
1.9.1
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