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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/common.c
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@@ -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;