Author: eugen
Date: Thu Jan 9 11:58:26 2020
New Revision: 356551
URL: https://svnweb.freebsd.org/changeset/base/356551
Log:
arp(8): avoid segfaulting due to out-of-bounds memory access
Fix obvious mistake that sometimes results in reading memory
past end of an array.
PR: 240825
MFC after: 1 week
Modified:
head/usr.sbin/arp/arp.c
Modified: head/usr.sbin/arp/arp.c
==============================================================================
--- head/usr.sbin/arp/arp.c Thu Jan 9 10:26:36 2020 (r356550)
+++ head/usr.sbin/arp/arp.c Thu Jan 9 11:58:26 2020 (r356551)
@@ -627,8 +627,7 @@ print_entry(struct sockaddr_dl *sdl,
} else
xo_emit("{d:/(incomplete)}{en:incomplete/true}");
- for (p = ifnameindex; p && ifnameindex->if_index &&
- ifnameindex->if_name; p++) {
+ for (p = ifnameindex; p && p->if_index && p->if_name; p++) {
if (p->if_index == sdl->sdl_index) {
xo_emit(" on {:interface/%s}", p->if_name);
break;
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