[src/trunk]: src/sys/net CID 980463: Provide common error path for rollback. ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/11ec41943142
branches:  trunk
changeset: 811668:11ec41943142
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Nov 10 17:59:37 2015 +0000

description:
CID 980463: Provide common error path for rollback. Remove extra check for
success.

diffstat:

 sys/net/if_gif.c |  42 +++++++++++++++++++++++++-----------------
 1 files changed, 25 insertions(+), 17 deletions(-)

diffs (100 lines):

diff -r b39d2de83046 -r 11ec41943142 sys/net/if_gif.c
--- a/sys/net/if_gif.c  Tue Nov 10 13:01:41 2015 +0000
+++ b/sys/net/if_gif.c  Tue Nov 10 17:59:37 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_gif.c,v 1.88 2015/08/24 22:21:26 pooka Exp $        */
+/*     $NetBSD: if_gif.c,v 1.89 2015/11/10 17:59:37 christos Exp $     */
 /*     $KAME: if_gif.c,v 1.76 2001/08/20 02:01:02 kjc Exp $    */
 
 /*
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.88 2015/08/24 22:21:26 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.89 2015/11/10 17:59:37 christos Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -669,6 +669,8 @@
 
        s = splsoftnet();
 
+       osrc = sc->gif_psrc;
+       odst = sc->gif_pdst;
        LIST_FOREACH(sc2, &gif_softc_list, gif_list) {
                if (sc2 == sc)
                        continue;
@@ -704,17 +706,23 @@
 #endif
                }
 
+       sc->gif_psrc = sc->gif_pdst = NULL;
+
        sc->gif_si = softint_establish(SOFTINT_NET, gifintr, sc);
        if (sc->gif_si == NULL) {
                error = ENOMEM;
                goto bad;
        }
 
-       osrc = sc->gif_psrc;
-       sc->gif_psrc = sockaddr_dup(src, M_WAITOK);
+       if ((sc->gif_psrc = sockaddr_dup(src, M_WAITOK)) == NULL) {
+               error = ENOMEM;
+               goto bad;
+       }
 
-       odst = sc->gif_pdst;
-       sc->gif_pdst = sockaddr_dup(dst, M_WAITOK);
+       if ((sc->gif_pdst = sockaddr_dup(dst, M_WAITOK)) == NULL) {
+               error = ENOMEM;
+               goto bad;
+       }
 
        switch (sc->gif_psrc->sa_family) {
 #ifdef INET
@@ -731,33 +739,33 @@
                error = EINVAL;
                break;
        }
-       if (error) {
-               /* rollback */
-               sockaddr_free(sc->gif_psrc);
-               sockaddr_free(sc->gif_pdst);
-               sc->gif_psrc = osrc;
-               sc->gif_pdst = odst;
+       if (error)
                goto bad;
-       }
 
        if (osrc)
                sockaddr_free(osrc);
        if (odst)
                sockaddr_free(odst);
 
-       if (sc->gif_psrc && sc->gif_pdst)
-               ifp->if_flags |= IFF_RUNNING;
-       else
-               ifp->if_flags &= ~IFF_RUNNING;
+       ifp->if_flags |= IFF_RUNNING;
        splx(s);
 
        return 0;
 
  bad:
+       /* rollback */
+       if (sc->gif_psrc != NULL)
+               sockaddr_free(sc->gif_psrc);
+       if (sc->gif_pdst != NULL)
+               sockaddr_free(sc->gif_pdst);
+       sc->gif_psrc = osrc;
+       sc->gif_pdst = odst;
+
        if (sc->gif_si) {
                softint_disestablish(sc->gif_si);
                sc->gif_si = NULL;
        }
+
        if (sc->gif_psrc && sc->gif_pdst)
                ifp->if_flags |= IFF_RUNNING;
        else