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| author | Denys Vlasenko | 2021-03-16 11:42:56 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2021-03-16 11:42:56 +0100 |
| commit | fe78d70ec6c48f88126f6deffe04d4707a65c9ac (patch) | |
| tree | c19b4ea47dad8bb445b25334d9b9b3e6adeffeb4 | |
| parent | 1c461df70ab357dc9e1e064540731c58e7859a45 (diff) | |
| download | busybox-fe78d70ec6c48f88126f6deffe04d4707a65c9ac.zip busybox-fe78d70ec6c48f88126f6deffe04d4707a65c9ac.tar.gz | |
udhcpc: ignore zero-length DHCP options, take 2
advance the optionptr by two bytes, not one
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | networking/udhcp/common.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c index 99ecb7a..f2d6907 100644 --- a/networking/udhcp/common.c +++ b/networking/udhcp/common.c @@ -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 */ |