DHCP: Appease LGTM finding unlikely user overflow from overself

Only in privsep.

diff --git a/src/dhcp.c b/src/dhcp.c
index 4015c65f290634ea75ac97d6725f2f860f342721..0c96ea93cf409779432d8f2cf8d3462f04e64718 100644 (file)
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -3556,6 +3556,15 @@ dhcp_recvmsg(struct dhcpcd_ctx *ctx, struct msghdr *msg)
        struct interface *ifp;
        const struct dhcp_state *state;
 
+#ifdef PRIVSEP
+       /* Unlikely, but appeases sanitizers. */
+       if (iov->iov_len > FRAMELEN_MAX) {
+               errno = ENOBUFS;
+               logerr(__func__);
+               return;
+       }
+#endif
+
        ifp = if_findifpfromcmsg(ctx, msg, NULL);
        if (ifp == NULL) {
                logerr(__func__);