if (ax25->digipeat != NULL) { kfree(ax25->digipeat); ax25->digipeat = NULL; } 
kfree(ax25->digipeat); ax25->digipeat = NULL; 
static int ax25_rcv(struct sk_buff *skb, struct net_device *dev,	ax25_address *dev_addr, struct packet_type *ptype){	ax25_address src, dest, *next_digi = NULL;	int type = 0, mine = 0, dama;	struct sock *make, *sk;	ax25_digi dp, reverse_dp;	ax25_cb *ax25;	ax25_dev *ax25_dev;	/*	 *	Process the AX.25/LAPB frame.	 */	skb->h.raw = skb->data;	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {		kfree_skb(skb);		return 0;	}	/*	 *	Parse the address header.	 */	if (ax25_addr_parse(skb->data, skb->len, &src, &dest, &dp, &type, &dama) == NULL) {		kfree_skb(skb);		return 0;	}	/*	 *	Ours perhaps ?	 */	if (dp.lastrepeat + 1 < dp.ndigi)		/* Not yet digipeated completely */		next_digi = &dp.calls[dp.lastrepeat + 1];	/*	 *	Pull of the AX.25 headers leaving the CTRL/PID bytes	 */	skb_pull(skb, ax25_addr_size(&dp));	/* For our port addresses ? */	if (ax25cmp(&dest, dev_addr) == 0 && dp.lastrepeat + 1 == dp.ndigi)		mine = 1;	/* Also match on any registered callsign from L3/4 */	if (!mine && ax25_listen_mine(&dest, dev) && dp.lastrepeat + 1 == dp.ndigi)		mine = 1;	/* UI frame - bypass LAPB processing */	if ((*skb->data & ~0x10) == AX25_UI && dp.lastrepeat + 1 == dp.ndigi) {		skb->h.raw = skb->data + 2;		/* skip control and pid */		ax25_send_to_raw(&dest, skb, skb->data[1]);		if (!mine && ax25cmp(&dest, (ax25_address *)dev->broadcast) != 0) {			kfree_skb(skb);			return 0;		}		/* Now we are pointing at the pid byte */		switch (skb->data[1]) {		case AX25_P_IP:			skb_pull(skb,2);		/* drop PID/CTRL */			skb->h.raw    = skb->data;			skb->nh.raw   = skb->data;			skb->dev      = dev;			skb->pkt_type = PACKET_HOST;			skb->protocol = htons(ETH_P_IP);			netif_rx(skb);			break;		case AX25_P_ARP:			skb_pull(skb,2);			skb->h.raw    = skb->data;			skb->nh.raw   = skb->data;			skb->dev      = dev;			skb->pkt_type = PACKET_HOST;			skb->protocol = htons(ETH_P_ARP);			netif_rx(skb);			break;		case AX25_P_TEXT:			/* Now find a suitable dgram socket */			sk = ax25_get_socket(&dest, &src, SOCK_DGRAM);			if (sk != NULL) {				bh_lock_sock(sk);				if (atomic_read(&sk->sk_rmem_alloc) >=				    sk->sk_rcvbuf) {					kfree_skb(skb);				} else {					/*					 *	Remove the control and PID.					 */					skb_pull(skb, 2);					if (sock_queue_rcv_skb(sk, skb) != 0)						kfree_skb(skb);				}				bh_unlock_sock(sk);				sock_put(sk);			} else {				kfree_skb(skb);			}			break;		default:			kfree_skb(skb);	/* Will scan SOCK_AX25 RAW sockets */			break;		}		return 0;	}	/*	 *	Is connected mode supported on this device ?	 *	If not, should we DM the incoming frame (except DMs) or	 *	silently ignore them. For now we stay quiet.	 */	if (ax25_dev->values[AX25_VALUES_CONMODE] == 0) {		kfree_skb(skb);		return 0;	}	/* LAPB */	/* AX.25 state 1-4 */	ax25_digi_invert(&dp, &reverse_dp);	if ((ax25 = ax25_find_cb(&dest, &src, &reverse_dp, dev)) != NULL) {		/*		 *	Process the frame. If it is queued up internally it		 *	returns one otherwise we free it immediately. This		 *	routine itself wakes the user context layers so we do		 *	no further work		 */		if (ax25_process_rx_frame(ax25, skb, type, dama) == 0)			kfree_skb(skb);		ax25_cb_put(ax25);		return 0;	}	/* AX.25 state 0 (disconnected) */	/* a) received not a SABM(E) */	if ((*skb->data & ~AX25_PF) != AX25_SABM &&	    (*skb->data & ~AX25_PF) != AX25_SABME) {		/*		 *	Never reply to a DM. Also ignore any connects for		 *	addresses that are not our interfaces and not a socket.		 */		if ((*skb->data & ~AX25_PF) != AX25_DM && mine)			ax25_return_dm(dev, &src, &dest, &dp);		kfree_skb(skb);		return 0;	}	/* b) received SABM(E) */	if (dp.lastrepeat + 1 == dp.ndigi)		sk = ax25_find_listener(&dest, 0, dev, SOCK_SEQPACKET);	else		sk = ax25_find_listener(next_digi, 1, dev, SOCK_SEQPACKET);	if (sk != NULL) {		bh_lock_sock(sk);		if (sk_acceptq_is_full(sk) ||		    (make = ax25_make_new(sk, ax25_dev)) == NULL) {			if (mine)				ax25_return_dm(dev, &src, &dest, &dp);			kfree_skb(skb);			bh_unlock_sock(sk);			sock_put(sk);			return 0;		}		ax25 = ax25_sk(make);		skb_set_owner_r(skb, make);		skb_queue_head(&sk->sk_receive_queue, skb);		make->sk_state = TCP_ESTABLISHED;		sk->sk_ack_backlog++;		bh_unlock_sock(sk);	} else {		if (!mine) {			kfree_skb(skb);			return 0;		}		if ((ax25 = ax25_create_cb()) == NULL) {			ax25_return_dm(dev, &src, &dest, &dp);			kfree_skb(skb);			return 0;		}		ax25_fillin_cb(ax25, ax25_dev);	}	ax25->source_addr = dest;	ax25->dest_addr   = src;	/*	 *	Sort out any digipeated paths.	 */	if (dp.ndigi && !ax25->digipeat &&	    (ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {		kfree_skb(skb);		ax25_destroy_socket(ax25);		if (sk)			sock_put(sk);		return 0;	}	if (dp.ndigi == 0) {		if (ax25->digipeat != NULL) {			kfree(ax25->digipeat);			ax25->digipeat = NULL;		}	} else {		/* Reverse the source SABM's path */		memcpy(ax25->digipeat, &reverse_dp, sizeof(ax25_digi));	}	if ((*skb->data & ~AX25_PF) == AX25_SABME) {		ax25->modulus = AX25_EMODULUS;		ax25->window  = ax25_dev->values[AX25_VALUES_EWINDOW];	} else {		ax25->modulus = AX25_MODULUS;		ax25->window  = ax25_dev->values[AX25_VALUES_WINDOW];	}	ax25_send_control(ax25, AX25_UA, AX25_POLLON, AX25_RESPONSE);#ifdef CONFIG_AX25_DAMA_SLAVE	if (dama && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)		ax25_dama_on(ax25);#endif	ax25->state = AX25_STATE_3;	ax25_cb_add(ax25);	ax25_start_heartbeat(ax25);	ax25_start_t3timer(ax25);	ax25_start_idletimer(ax25);	if (sk) {		if (!sock_flag(sk, SOCK_DEAD))			sk->sk_data_ready(sk, skb->len);		sock_put(sk);	} else		kfree_skb(skb);	return 0;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/a51482bde22f99c63fbbb57d5d46cc666384e379/ax25_in.c/buggy/net/ax25/ax25_in.c