fe78d70ec
Denys Vlasenko
2021-03-16
Subject
udhcpc: ignore zero-length DHCP options, take 2
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networking/udhcp/common.c+3 -3
| @@ -282,11 +282,11 @@ uint8_t* FAST_FUNC udhcp_scan_options(struct dhcp_packet *packet, struct dhcp_sc | |
| * (this violates RFC 2132 section 3.14). | |
| */ | |
| if (len == 0) { | |
| - | scan_state->rem -= OPT_LEN; |
| - | scan_state->optionptr += OPT_LEN; |
| + | scan_state->rem -= 2; |
| + | scan_state->optionptr += 2; |
| continue; | |
| } | |
| - | len += OPT_LEN; |
| + | len += 2; |
| scan_state->rem -= len; | |
| if (scan_state->rem < 0) /* option is longer than options field? */ | |
| goto complain; /* yes, complain and return NULL */ | |