From 7cca0da1cc58bd589989684147ae3a0cd5819902 Mon Sep 17 00:00:00 2001
From: Pau Espin Pedrol <pespin@sysmocom.de>
Date: Mon, 14 Aug 2017 17:19:55 +0200
Subject: osmux: Fix buffer overflow in osmux_snprintf

When running osmux_test on my PC, the process was aborted with a "stack
smashing detected" error.

Change-Id: I8a7cc422c181c0c5712ac8976a5be5f0ad44a9c0
---
 src/osmux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/osmux.c b/src/osmux.c
index 23a6440..2481d6a 100644
--- a/src/osmux.c
+++ b/src/osmux.c
@@ -847,7 +847,7 @@ void osmux_xfrm_output_init(struct osmux_out_handle *h, uint32_t rtp_ssrc)
 }
 
 #define SNPRINTF_BUFFER_SIZE(ret, size, len, offset)	\
-	size += ret;					\
+	size -= ret;					\
 	if (ret > len)					\
 		ret = len;				\
 	offset += ret;					\
-- 
cgit v1.2.3