From fa07767115f849081a58c5ae686a000450444f06 Mon Sep 17 00:00:00 2001
From: Boris Faure <billiob@gmail.com>
Date: Sun, 7 Jul 2019 18:06:29 +0200
Subject: [PATCH] tytest: fix runtime error: null pointer passed as argument 2,
 which is declared to never be null

---
 src/bin/tytest.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/bin/tytest.c b/src/bin/tytest.c
index 88f14785..7600abe6 100644
--- a/src/bin/tytest.c
+++ b/src/bin/tytest.c
@@ -139,8 +139,11 @@ _tytest_checksum(Termpty *ty)
    MD5Update(&ctx, (unsigned char const*)_cursor_shape,
              strlen(_cursor_shape));
    /* Write buffer */
-   MD5Update(&ctx, (unsigned char const*)ty->write_buffer.buf,
-             ty->write_buffer.len);
+   if (ty->write_buffer.buf)
+     {
+        MD5Update(&ctx, (unsigned char const*)ty->write_buffer.buf,
+                  ty->write_buffer.len);
+     }
 
    MD5Final(hash, &ctx);