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-rw-r--r--iptables-save.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/iptables-save.c b/iptables-save.c
index bf75d5e0..c25e636c 100644
--- a/iptables-save.c
+++ b/iptables-save.c
@@ -48,7 +48,9 @@ print_iface(char letter, const char *iface, const unsigned char *mask,
if (iface[i] != '\0')
printf("%c", iface[i]);
} else {
- if (iface[i] != '\0')
+ /* we can access iface[i-1] here, because
+ * a few lines above we make sure that mask[0] != 0 */
+ if (iface[i-1] != '\0')
printf("+");
break;
}