From 64cb40f06671ca1a87cd87dfb2b7f399fbfddeda Mon Sep 17 00:00:00 2001
From: Mike Black W9MDB <mdblack98@yahoo.com>
Date: Wed, 19 Jul 2023 12:30:21 -0500
Subject: [PATCH] Fix segfault with testrig and fifo bad values

---
 src/fifo.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/fifo.c b/src/fifo.c
index abcb795b6..1867e5ed9 100644
--- a/src/fifo.c
+++ b/src/fifo.c
@@ -37,6 +37,8 @@ int push(FIFO_RIG *fifo, const char *msg)
 
 int peek(FIFO_RIG *fifo)
 {
+    if (fifo->tail < 0 || fifo->head < 0) return -1;
+    if (fifo->tail > 1023 || fifo->head > 1023) return -1;
     if (fifo->tail == fifo->head) { return -1; }
     char c = fifo->data[fifo->head];
     rig_debug(RIG_DEBUG_VERBOSE, "%s: peek %c (%d,%d)\n", __func__, c, fifo->head,