Commit 77ff72d5 authored by Andrea Bittau's avatar Andrea Bittau Committed by David S. Miller
Browse files

[DCCP] CCID2: Drop sock reference count on timer expiration and reset. 



There was a hybrid use of standard timers and sk_timers.  This caused
the reference count of the sock to be incorrect when resetting the RTO
timer.  The sock reference count should now be correct, enabling its
destruction, and allowing the DCCP module to be unloaded.

Signed-off-by: default avatarAndrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
parent ba66c6e8

net/dccp/ccids/ccid2.c

+15 −11
Original line number Diff line number Diff line
@@ -234,7 +234,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data) 
	ccid2_hc_tx_check_sanity(hctx);

out:

	bh_unlock_sock(sk);

/*	sock_put(sk); */

	sock_put(sk);

}



static void ccid2_start_rto_timer(struct sock *sk)
@@ -399,9 +399,11 @@ out_invalid_option: 
	return -1;

}



static void ccid2_hc_tx_kill_rto_timer(struct ccid2_hc_tx_sock *hctx)

static void ccid2_hc_tx_kill_rto_timer(struct sock *sk)

{

	if (del_timer(&hctx->ccid2hctx_rtotimer))

	struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);



	sk_stop_timer(sk, &hctx->ccid2hctx_rtotimer);

	ccid2_pr_debug("deleted RTO timer\n");

}
@@ -496,17 +498,19 @@ static inline void ccid2_new_ack(struct sock *sk, 
	}



	/* we got a new ack, so re-start RTO timer */

	ccid2_hc_tx_kill_rto_timer(hctx);

	ccid2_hc_tx_kill_rto_timer(sk);

	ccid2_start_rto_timer(sk);

}



static void ccid2_hc_tx_dec_pipe(struct ccid2_hc_tx_sock *hctx)

static void ccid2_hc_tx_dec_pipe(struct sock *sk)

{

	struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);



	hctx->ccid2hctx_pipe--;

	BUG_ON(hctx->ccid2hctx_pipe < 0);



	if (hctx->ccid2hctx_pipe == 0)

		ccid2_hc_tx_kill_rto_timer(hctx);

		ccid2_hc_tx_kill_rto_timer(sk);

}



static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
@@ -627,7 +631,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
					seqp->ccid2s_acked = 1;

					ccid2_pr_debug("Got ack for %llu\n",

					       	       seqp->ccid2s_seq);

					ccid2_hc_tx_dec_pipe(hctx);

					ccid2_hc_tx_dec_pipe(sk);

				}

				if (seqp == hctx->ccid2hctx_seqt) {

					done = 1;
@@ -674,7 +678,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
		while (1) {

			if (!seqp->ccid2s_acked) {

				loss = 1;

				ccid2_hc_tx_dec_pipe(hctx);

				ccid2_hc_tx_dec_pipe(sk);

			}

			if (seqp == hctx->ccid2hctx_seqt)

				break;
@@ -760,9 +764,9 @@ static int ccid2_hc_tx_init(struct sock *sk) 
static void ccid2_hc_tx_exit(struct sock *sk)

{

	struct dccp_sock *dp = dccp_sk(sk);

        struct ccid2_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;

        struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);



	ccid2_hc_tx_kill_rto_timer(hctx);

	ccid2_hc_tx_kill_rto_timer(sk);



	kfree(hctx->ccid2hctx_seqbuf);

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