For both ifconfig and route if we didn't get enough memory from the

prior sysctl due to the structure growing between calls try again.

Also try again for deleting routes if things fail.  We've seen
route -f fail this way which does not actually flush all routes.
This fixes it.  It will whine but it will do the work.

PR:		56732
Obtained from:	IronPort

1 files changed, 10 insertions, 2 deletions

diff --git a/sbin/ifconfig/ifconfig.c b/sbin/ifconfig/ifconfig.c
index 27ffcda..b35ed9e 100644
--- a/sbin/ifconfig/ifconfig.c
+++ b/sbin/ifconfig/ifconfig.c
@@ -417,7 +417,7 @@ main(int argc, char *argv[])
 {
 	int c;
 	int all, namesonly, downonly, uponly;
-	int need_nl = 0;
+	int need_nl = 0, count = 0;
 	const struct afswtch *afp = 0;
 	int addrcount, ifindex;
 	struct	if_msghdr *ifm, *nextifm;
@@ -543,6 +543,7 @@ main(int argc, char *argv[])
 			afp = NULL;	/* not a family, NULL */
 	}
 
+retry:
 	mib[0] = CTL_NET;
 	mib[1] = PF_ROUTE;
 	mib[2] = 0;
@@ -558,8 +559,15 @@ main(int argc, char *argv[])
 		errx(1, "iflist-sysctl-estimate");
 	if ((buf = malloc(needed)) == NULL)
 		errx(1, "malloc");
-	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
+		if (errno == ENOMEM && count++ < 10) {
+			warnx("Routing table grew, retrying");
+			free(buf);
+			sleep(1);
+			goto retry;
+		}
 		errx(1, "actual retrieval of interface table");
+	}
 	lim = buf + needed;
 
 	next = buf;