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-rw-r--r--networking/udhcp/dhcpd.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index 3e08ec011..9d6604943 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -192,6 +192,8 @@ static struct dyn_lease *add_lease(
* but merely make dumpleases output safe for shells to use.
* We accept "0-9A-Za-z._-", all other chars turn to dots.
*/
+ if (*p == '-')
+ *p = '.'; /* defeat "-option" attacks too */
while (*p) {
if (!isalnum(*p) && *p != '-' && *p != '_')
*p = '.';