netcred free(9) sizes

[Martin Pieuchot]

Keep track of the allocated size and use it later :)

ok?

Index: kern/vfs_subr.c
===================================================================
RCS file: /cvs/src/sys/kern/vfs_subr.c,v
retrieving revision 1.282
diff -u -p -r1.282 vfs_subr.c
--- kern/vfs_subr.c     29 Sep 2018 04:29:48 -0000      1.282
+++ kern/vfs_subr.c     18 Nov 2018 16:05:25 -0000
@@ -1424,6 +1424,7 @@ vfs_hang_addrlist(struct mount *mp, stru
                return (EINVAL);
        nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
        np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO);
+       np->netc_len = nplen;
        saddr = (struct sockaddr *)(np + 1);
        error = copyin(argp->ex_addr, saddr, argp->ex_addrlen);
        if (error)
@@ -1466,7 +1467,7 @@ finish:
        np->netc_exflags = argp->ex_flags;
        return (0);
 out:
-       free(np, M_NETADDR, nplen);
+       free(np, M_NETADDR, np->netc_len);
        return (error);
 }
 
@@ -1474,9 +1475,10 @@ int
 vfs_free_netcred(struct radix_node *rn, void *w, u_int id)
 {
        struct radix_node_head *rnh = (struct radix_node_head *)w;
+       struct netcred * np = (struct netcred *)rn;
 
        rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL);
-       free(rn, M_NETADDR, 0);
+       free(np, M_NETADDR, np->netc_len);
        return (0);
 }
 
@@ -1490,7 +1492,7 @@ vfs_free_addrlist(struct netexport *nep)
 
        if ((rnh = nep->ne_rtable_inet) != NULL) {
                rn_walktree(rnh, vfs_free_netcred, rnh);
-               free(rnh, M_RTABLE, 0);
+               free(rnh, M_RTABLE, sizeof(*rnh));
                nep->ne_rtable_inet = NULL;
        }
 }
Index: sys/mount.h
===================================================================
RCS file: /cvs/src/sys/sys/mount.h,v
retrieving revision 1.142
diff -u -p -r1.142 mount.h
--- sys/mount.h 29 Sep 2018 04:29:48 -0000      1.142
+++ sys/mount.h 18 Nov 2018 16:00:22 -0000
@@ -552,6 +552,7 @@ struct vfsops {
 struct netcred {
        struct  radix_node netc_rnodes[2];
        int     netc_exflags;
+       int     netc_len;                       /* size of the allocation */
        struct  ucred netc_anon;
 };