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-rw-r--r--mdk-stage1/network.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/mdk-stage1/network.c b/mdk-stage1/network.c
index 7e154de2a..4efecda13 100644
--- a/mdk-stage1/network.c
+++ b/mdk-stage1/network.c
@@ -311,11 +311,11 @@ char * guess_netmask(char * ip_addr)
struct in_addr addr;
unsigned long int tmp;
- log_message("guessing netmask");
-
if (streq(ip_addr, "") || !inet_aton(ip_addr, &addr))
return "";
+ log_message("guessing netmask");
+
tmp = ntohl(addr.s_addr);
if (((tmp & 0xFF000000) >> 24) <= 127)
@@ -372,7 +372,7 @@ static enum return_type setup_network_interface(struct interface_info * intf)
if (results != RETURN_OK)
return setup_network_interface(intf);
- if (!inet_aton(answers[0], &addr)) {
+ if (streq(answers[0], "") || !inet_aton(answers[0], &addr)) {
stg1_error_message("Invalid IP address.");
return setup_network_interface(intf);
}
@@ -391,6 +391,10 @@ static enum return_type setup_network_interface(struct interface_info * intf)
if ((streq(answers[3], "") && inet_aton(guess_netmask(answers[0]), &addr))
|| inet_aton(answers[3], &addr))
memcpy(&intf->netmask, &addr, sizeof(addr));
+ else {
+ stg1_error_message("Invalid netmask.");
+ return setup_network_interface(intf);
+ }
*((uint32_t *) &intf->broadcast) = (*((uint32_t *) &intf->ip) &
*((uint32_t *) &intf->netmask)) | ~(*((uint32_t *) &intf->netmask));