diff --git a/channels/chan_skinny.c b/channels/chan_skinny.c
index 98d9d86d8ffb6e6db20e1927e232c71300e3b9bd..9de3faea689ae5320c8017f1bd1481de091eddc6 100644
--- a/channels/chan_skinny.c
+++ b/channels/chan_skinny.c
@@ -2305,6 +2305,10 @@ static int get_input(struct skinnysession *s)
 			return -1;
 		}
 		dlen = *(int *)s->inbuf;
+		if (dlen < 0) {
+			ast_log(LOG_WARNING, "Skinny Client sent invalid data.\n");
+			return -1;
+		}
 		if (dlen+8 > sizeof(s->inbuf))
 			dlen = sizeof(s->inbuf) - 8;
 		res = read(s->fd, s->inbuf+4, dlen+4);