File udhcpc-when-decoding-DHCP_SUBNET-ensure-it-is-4-bytes-long.patch of Package busybox.20467
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Mon Jan 7 15:33:42 2019 +0100
Subject: udhcpc: when decoding DHCP_SUBNET, ensure it is 4 bytes long
Patch-mainline: 74d9f1ba37010face4bd1449df4d60dd84450b06
Git-repo: https://git.busybox.net/busybox
Git-commit: 9730b5cf766363f872e74c1a3c530af5637e9f11
References:
function old new delta
udhcp_run_script 795 801 +6
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
networking/udhcp/common.c | 2 +-
networking/udhcp/common.h | 2 +-
networking/udhcp/dhcpc.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 95900da73..d6428e3f6 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -293,7 +293,7 @@ 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 1e89351c6..c137cbc35 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -117,7 +117,7 @@ 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 /* either client informs server or server gives name to client */
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index cc8c0d6d3..22d9e8c52 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -522,7 +522,7 @@ 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);
