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author | Robert Watson <rwatson@FreeBSD.org> | 2005-01-09 05:25:02 +0000 |
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committer | Robert Watson <rwatson@FreeBSD.org> | 2005-01-09 05:25:02 +0000 |
commit | 2375a5a16a2eefb343b1b556b0890526faac9fe5 (patch) | |
tree | 97414cfed637b14c280f55c64cdbaa998add7dea /sys/netipx | |
parent | 971365a71147b2822c4ffde94dbfa26231478e08 (diff) | |
download | src-2375a5a16a2eefb343b1b556b0890526faac9fe5.tar.gz src-2375a5a16a2eefb343b1b556b0890526faac9fe5.zip |
Clean up return handling for a number of SPX-related routines that
were derived from more complex TCP versions of the same:
- spx_close(), spx_disconnect(), spx_drop(), and spx_usrclosed() all
always free's the spxpcb invalidating the argument, so a return
value is not required to indicate if it has.
- Annotate that the cb arguments to each of these functions is
invalidated via a comment.
- When tearing down a pcb due to sonewconn() having failed, mark the
cb as NULL; later, when deciding whether to store trace information
due to SO_DEBUG, check that cb is not NULL before dereferencing or
a NULL pointer dereference may occur.
MFC after: 3 weeks
Notes
Notes:
svn path=/head/; revision=139931
Diffstat (limited to 'sys/netipx')
-rw-r--r-- | sys/netipx/spx_usrreq.c | 51 |
1 files changed, 29 insertions, 22 deletions
diff --git a/sys/netipx/spx_usrreq.c b/sys/netipx/spx_usrreq.c index 0be4daa7f402..94e3e7251ba0 100644 --- a/sys/netipx/spx_usrreq.c +++ b/sys/netipx/spx_usrreq.c @@ -1,5 +1,5 @@ /*- - * Copyright (c) 2004 Robert N. M. Watson + * Copyright (c) 2004-2005 Robert N. M. Watson * Copyright (c) 1995, Mike Mitchell * Copyright (c) 1984, 1985, 1986, 1987, 1993 * The Regents of the University of California. All rights reserved. @@ -81,15 +81,15 @@ static struct spx_istat spx_istat; static const int spx_backoff[SPX_MAXRXTSHIFT+1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; -static struct spxpcb *spx_close(struct spxpcb *cb); -static struct spxpcb *spx_disconnect(struct spxpcb *cb); -static struct spxpcb *spx_drop(struct spxpcb *cb, int errno); +static void spx_close(struct spxpcb *cb); +static void spx_disconnect(struct spxpcb *cb); +static void spx_drop(struct spxpcb *cb, int errno); static int spx_output(struct spxpcb *cb, struct mbuf *m0); static int spx_reass(struct spxpcb *cb, struct spx *si); static void spx_setpersist(struct spxpcb *cb); static void spx_template(struct spxpcb *cb); static struct spxpcb *spx_timers(struct spxpcb *cb, int timer); -static struct spxpcb *spx_usrclosed(struct spxpcb *cb); +static void spx_usrclosed(struct spxpcb *cb); static int spx_usr_abort(struct socket *so); static int spx_accept(struct socket *so, struct sockaddr **nam); @@ -344,12 +344,14 @@ dropwithreset: so->so_head = NULL; ACCEPT_UNLOCK(); soabort(so); + cb = NULL; } si->si_seq = ntohs(si->si_seq); si->si_ack = ntohs(si->si_ack); si->si_alo = ntohs(si->si_alo); m_freem(dtom(si)); - if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs) + if (cb == NULL || cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || + traceallspxs) spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0); return; @@ -1590,22 +1592,18 @@ static int spx_shutdown(so) struct socket *so; { - int error; int s; struct ipxpcb *ipxp; struct spxpcb *cb; - error = 0; ipxp = sotoipxpcb(so); cb = ipxtospxpcb(ipxp); s = splnet(); socantsendmore(so); - cb = spx_usrclosed(cb); - if (cb != NULL) - error = spx_output(cb, NULL); + spx_usrclosed(cb); splx(s); - return (error); + return (0); } static int @@ -1659,8 +1657,9 @@ spx_template(cb) * discard spx control block itself * discard ipx protocol control block * wake up any sleepers + * cb will always be invalid after this call. */ -static struct spxpcb * +void spx_close(cb) register struct spxpcb *cb; { @@ -1682,33 +1681,39 @@ spx_close(cb) soisdisconnected(so); ipx_pcbdetach(ipxp); spxstat.spxs_closed++; - return (NULL); } /* * Someday we may do level 3 handshaking * to close a connection or send a xerox style error. * For now, just close. + * cb will always be invalid after this call. */ -static struct spxpcb * +static void spx_usrclosed(cb) register struct spxpcb *cb; { - return (spx_close(cb)); + + spx_close(cb); } -static struct spxpcb * +/* + * cb will always be invalid after this call. + */ +static void spx_disconnect(cb) register struct spxpcb *cb; { - return (spx_close(cb)); + + spx_close(cb); } /* * Drop connection, reporting * the specified error. + * cb will always be invalid after this call. */ -static struct spxpcb * +static void spx_drop(cb, errno) register struct spxpcb *cb; int errno; @@ -1727,7 +1732,7 @@ spx_drop(cb, errno) } else spxstat.spxs_conndrops++; so->so_error = errno; - return (spx_close(cb)); + spx_close(cb); } /* @@ -1827,7 +1832,8 @@ spx_timers(cb, timer) if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) { cb->s_rxtshift = SPX_MAXRXTSHIFT; spxstat.spxs_timeoutdrop++; - cb = spx_drop(cb, ETIMEDOUT); + spx_drop(cb, ETIMEDOUT); + cb = NULL; break; } spxstat.spxs_rexmttimeo++; @@ -1892,7 +1898,8 @@ spx_timers(cb, timer) break; dropit: spxstat.spxs_keepdrops++; - cb = spx_drop(cb, ETIMEDOUT); + spx_drop(cb, ETIMEDOUT); + cb = NULL; break; } return (cb); |