From: Gerrit Renker Date: Wed, 26 Sep 2007 14:24:28 +0000 (-0300) Subject: [CCID3]: Move NULL-protection into function X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2e86908f7dfb71b67ca4739d9a6c678b83b01078;p=linux-beck.git [CCID3]: Move NULL-protection into function This moves several instances of testing against NULL into the function which is used to de-reference the CCID-private data. Committer note: Made the BUG_ON depend on having CONFIG_IP_DCCP_CCID3_DEBUG, as it is too much to have this on production code. Also made sure that the macro is used only after checking if sk_state is not LISTEN, to make it equivalent to what we had before. Signed-off-by: Gerrit Renker Signed-off-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index 0bb338be9dd7..a4099398bcc8 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -302,8 +302,6 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb) ktime_t now = ktime_get_real(); s64 delay; - BUG_ON(hctx == NULL); - /* * This function is called only for Data and DataAck packets. Sending * zero-sized Data(Ack)s is theoretically possible, but for congestion @@ -383,8 +381,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); struct dccp_tx_hist_entry *packet; - BUG_ON(hctx == NULL); - ccid3_hc_tx_update_s(hctx, len); packet = dccp_tx_hist_entry_new(ccid3_tx_hist, GFP_ATOMIC); @@ -409,8 +405,6 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) unsigned long t_nfb; u32 pinv, r_sample; - BUG_ON(hctx == NULL); - /* we are only interested in ACKs */ if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK || DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK)) @@ -551,8 +545,6 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option, struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); struct ccid3_options_received *opt_recv; - BUG_ON(hctx == NULL); - opt_recv = &hctx->ccid3hctx_options_received; if (opt_recv->ccid3or_seqno != dp->dccps_gsr) { @@ -626,8 +618,6 @@ static void ccid3_hc_tx_exit(struct sock *sk) { struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); - BUG_ON(hctx == NULL); - ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM); sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer); @@ -637,14 +627,13 @@ static void ccid3_hc_tx_exit(struct sock *sk) static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) { - const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); + struct ccid3_hc_tx_sock *hctx; /* Listen socks doesn't have a private CCID block */ if (sk->sk_state == DCCP_LISTEN) return; - BUG_ON(hctx == NULL); - + hctx = ccid3_hc_tx_sk(sk); info->tcpi_rto = hctx->ccid3hctx_t_rto; info->tcpi_rtt = hctx->ccid3hctx_rtt; } @@ -652,13 +641,14 @@ static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info) static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len, u32 __user *optval, int __user *optlen) { - const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); + const struct ccid3_hc_tx_sock *hctx; const void *val; /* Listen socks doesn't have a private CCID block */ if (sk->sk_state == DCCP_LISTEN) return -EINVAL; + hctx = ccid3_hc_tx_sk(sk); switch (optname) { case DCCP_SOCKOPT_CCID_TX_INFO: if (len < sizeof(hctx->ccid3hctx_tfrc)) @@ -772,14 +762,13 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk) static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb) { - const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); + const struct ccid3_hc_rx_sock *hcrx; __be32 x_recv, pinv; - BUG_ON(hcrx == NULL); - if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN)) return 0; + hcrx = ccid3_hc_rx_sk(sk); DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter; if (dccp_packet_without_ack(skb)) @@ -870,8 +859,6 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb) int loss, payload_size; ktime_t now; - BUG_ON(hcrx == NULL); - opt_recv = &dccp_sk(sk)->dccps_options_received; switch (DCCP_SKB_CB(skb)->dccpd_type) { @@ -985,8 +972,6 @@ static void ccid3_hc_rx_exit(struct sock *sk) { struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); - BUG_ON(hcrx == NULL); - ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM); /* Empty packet history */ @@ -998,14 +983,13 @@ static void ccid3_hc_rx_exit(struct sock *sk) static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) { - const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); + const struct ccid3_hc_rx_sock *hcrx; /* Listen socks doesn't have a private CCID block */ if (sk->sk_state == DCCP_LISTEN) return; - BUG_ON(hcrx == NULL); - + hcrx = ccid3_hc_rx_sk(sk); info->tcpi_ca_state = hcrx->ccid3hcrx_state; info->tcpi_options |= TCPI_OPT_TIMESTAMPS; info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt; @@ -1014,13 +998,14 @@ static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info) static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len, u32 __user *optval, int __user *optlen) { - const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk); + const struct ccid3_hc_rx_sock *hcrx; const void *val; /* Listen socks doesn't have a private CCID block */ if (sk->sk_state == DCCP_LISTEN) return -EINVAL; + hcrx = ccid3_hc_rx_sk(sk); switch (optname) { case DCCP_SOCKOPT_CCID_RX_INFO: if (len < sizeof(hcrx->ccid3hcrx_tfrc)) diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h index 7cbf2b1329d9..ae99ec430371 100644 --- a/net/dccp/ccids/ccid3.h +++ b/net/dccp/ccids/ccid3.h @@ -117,6 +117,15 @@ struct ccid3_hc_tx_sock { struct ccid3_options_received ccid3hctx_options_received; }; +static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk) +{ + struct ccid3_hc_tx_sock *hctx = ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); +#ifdef CONFIG_IP_DCCP_CCID3_DEBUG + BUG_ON(hctx == NULL); +#endif + return hctx; +} + /* TFRC receiver states */ enum ccid3_hc_rx_states { TFRC_RSTATE_NO_DATA = 1, @@ -161,14 +170,13 @@ struct ccid3_hc_rx_sock { u32 ccid3hcrx_elapsed_time; }; -static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk) -{ - return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid); -} - static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk) { - return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); + struct ccid3_hc_rx_sock *hcrx = ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid); +#ifdef CONFIG_IP_DCCP_CCID3_DEBUG + BUG_ON(hcrx == NULL); +#endif + return hcrx; } #endif /* _DCCP_CCID3_H_ */