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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-01-07 15:33:42 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2019-01-07 15:33:42 +0100
commit74d9f1ba37010face4bd1449df4d60dd84450b06 (patch)
treeec6b078d67826b01c69ad533376be7c763596bd2
parentb80bdeba0248e2742cf801e7429d5d7aad69d26d (diff)
downloadbusybox-74d9f1ba37010face4bd1449df4d60dd84450b06.tar.gz
busybox-74d9f1ba37010face4bd1449df4d60dd84450b06.tar.bz2
udhcpc: when decoding DHCP_SUBNET, ensure it is 4 bytes long
function old new delta udhcp_run_script 795 801 +6 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/udhcp/common.c2
-rw-r--r--networking/udhcp/common.h2
-rw-r--r--networking/udhcp/dhcpc.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 4c2221b77..fc4de5716 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -302,7 +302,7 @@ uint8_t* FAST_FUNC udhcp_get_option32(struct dhcp_packet *packet, int code)
{
uint8_t *r = udhcp_get_option(packet, code);
if (r) {
- if (r[-1] != 4)
+ if (r[-OPT_DATA + OPT_LEN] != 4)
r = NULL;
}
return r;
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 9511152ff..62f9a2a4a 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -119,7 +119,7 @@ enum {
//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
//#define DHCP_DNS_SERVER 0x06
-//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
+//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog) */
//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
//#define DHCP_LPR_SERVER 0x09
#define DHCP_HOST_NAME 0x0c /* 12: either client informs server or server gives name to client */
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 5b3fd531c..dcec8cdfd 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -531,7 +531,7 @@ static char **fill_envp(struct dhcp_packet *packet)
temp = udhcp_get_option(packet, code);
*curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name);
putenv(*curr++);
- if (code == DHCP_SUBNET) {
+ if (code == DHCP_SUBNET && temp[-OPT_DATA + OPT_LEN] == 4) {
/* Subnet option: make things like "$ip/$mask" possible */
uint32_t subnet;
move_from_unaligned32(subnet, temp);