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unix/caif: sk_socket can disappear when state is unlocked

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got a rare NULL pointer dereference in clear_bit

Signed-off-by: Mark Salyzyn <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
----
v2: switch to sock_flag(sk, SOCK_DEAD) and added net/caif/caif_socket.c
v3: return -ECONNRESET in upstream caller of wait function for SOCK_DEAD
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Mark Salyzyn 2015-05-26 08:22:19 -07:00 • committed by David S. Miller
commit b48732e4a4
2 changed files with 16 additions and 0 deletions
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8
net/caif/caif_socket.c
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@ -330,6 +330,10 @@ static long caif_stream_data_wait(struct sock *sk, long timeo)
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
if (sock_flag(sk, SOCK_DEAD))
break;
clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
}
@ -373,6 +377,10 @@ static int caif_stream_recvmsg(struct socket *sock, struct msghdr *msg,
struct sk_buff *skb;
lock_sock(sk);
if (sock_flag(sk, SOCK_DEAD)) {
err = -ECONNRESET;
goto unlock;
}
skb = skb_dequeue(&sk->sk_receive_queue);
caif_check_flow_release(sk);