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udhcpc: when decoding DHCP_SUBNET, ensure it is 4 bytes long

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function                                             old     new   delta
udhcp_run_script                                     795     801      +6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2019-01-07 15:33:42 +01:00
parent b80bdeba02
commit 74d9f1ba37
3 changed files with 3 additions and 3 deletions
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2
networking/udhcp/dhcpc.c
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@@ -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);