From 7f44c02f456f7b715044f2537e21c86cc2776fa5 Mon Sep 17 00:00:00 2001
From: mjc <17681860670@163.com>
Date: Mon, 6 Jan 2020 14:41:12 +0800
Subject: [PATCH] core/ringbuffer: compensate 'ringbuffer_remove' underflow
 error

When rb->start = rb->size, `ringbuffer_get_one(ringbuffer_t *restrict rb)`
will read out of bounds.
---
 core/ringbuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/ringbuffer.c b/core/ringbuffer.c
index b79c7560fc..4e09ecb3e5 100644
--- a/core/ringbuffer.c
+++ b/core/ringbuffer.c
@@ -121,7 +121,7 @@ unsigned ringbuffer_remove(ringbuffer_t *restrict rb, unsigned n)
         rb->avail -= n;
 
         /* compensate underflow */
-        if (rb->start > rb->size) {
+        if (rb->start >= rb->size) {
             rb->start -= rb->size;
         }
     }