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net: tcp_probe: kprobes: adapt jtcp_rcv_established signature

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This patches fixes a rather unproblematic function signature mismatch
as the const specifier was missing for the th variable; and next to
that it adds a build-time assertion so that future function signature
mismatches for kprobes will not end badly, similarly as commit 22222997
("net: sctp: add build check for sctp_sf_eat_sack_6_2/jsctp_sf_eat_sack")
did it for SCTP.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-08-21 19:47:59 +02:00 committed by David S. Miller
parent b4c1c1d038
commit d8cdeda6dd
1 changed files with 8 additions and 1 deletions
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9
net/ipv4/tcp_probe.c
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@ -92,7 +92,7 @@ static inline int tcp_probe_avail(void)
* Note: arguments must match tcp_rcv_established()! * Note: arguments must match tcp_rcv_established()!
*/ */
static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb, static int jtcp_rcv_established(struct sock *sk, struct sk_buff *skb,
struct tcphdr *th, unsigned int len) const struct tcphdr *th, unsigned int len)
{ {
const struct tcp_sock *tp = tcp_sk(sk); const struct tcp_sock *tp = tcp_sk(sk);
const struct inet_sock *inet = inet_sk(sk); const struct inet_sock *inet = inet_sk(sk);
@ -225,6 +225,13 @@ static __init int tcpprobe_init(void)
{ {
int ret = -ENOMEM; int ret = -ENOMEM;
/* Warning: if the function signature of tcp_rcv_established,
* has been changed, you also have to change the signature of
* jtcp_rcv_established, otherwise you end up right here!
*/
BUILD_BUG_ON(__same_type(tcp_rcv_established,
jtcp_rcv_established) == 0);
init_waitqueue_head(&tcp_probe.wait); init_waitqueue_head(&tcp_probe.wait);
spin_lock_init(&tcp_probe.lock); spin_lock_init(&tcp_probe.lock);