From: Guy Harris <guy@alum.mit.edu>
Date: Mon, 22 Oct 2018 08:23:45 +0000 (-0700)
Subject: Handle *all* protocol qualifiers in gen_host() - even link/tr/etc.
X-Git-Tag: libpcap-1.10-bp~762
X-Git-Url: https://git.tcpdump.org/libpcap/commitdiff_plain/dcce86c9adf20c71bf2b4405270a6e3ffeb12013

Handle *all* protocol qualifiers in gen_host() - even link/tr/etc.

We missed that one.

Credit to OSS-Fuzz for finding this issue.
---

diff --git a/gencode.c b/gencode.c
index 536c73d2..33d81d82 100644
--- a/gencode.c
+++ b/gencode.c
@@ -4814,6 +4814,9 @@ gen_host(compiler_state_t *cstate, bpf_u_int32 addr, bpf_u_int32 mask,
 		}
 		return b0;
 
+	case Q_LINK:
+		bpf_error(cstate, "link-layer modifier applied to %s", typestr);
+
 	case Q_IP:
 		return gen_hostop(cstate, addr, mask, dir, ETHERTYPE_IP, 12, 16);