1 files changed, 11 insertions, 0 deletions
diff --git a/pcap-bpf.c b/pcap-bpf.c
index 38844887..7286d884 100644
--- a/pcap-bpf.c
+++ b/pcap-bpf.c
@@ -1672,6 +1672,17 @@ pcap_activate_bpf(pcap_t *p)
 		goto bad;
 	}
 
+	/*
+	 * Turn a negative snapshot value (invalid), a snapshot value of
+	 * 0 (unspecified), or a value bigger than the normal maximum
+	 * value, into the maximum allowed value.
+	 *
+	 * If some application really *needs* a bigger snapshot
+	 * length, we should just increase MAXIMUM_SNAPLEN.
+	 */
+	if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
+		p->snapshot = MAXIMUM_SNAPLEN;
+
 #if defined(LIFNAMSIZ) && defined(ZONENAME_MAX) && defined(lifr_zoneid)
 	/*
 	 * Retrieve the zoneid of the zone we are currently executing in.