commit 6281815eccc3ded54960f7798833ceb39561b9a0
author Bram Moolenaar <Bram@vim.org> Sun Feb 14 15:37:30 2021 +0100
committer Bram Moolenaar <Bram@vim.org> Sun Feb 14 15:37:30 2021 +0100
tree 72c092d24c42b3e01f2dc184ba05c71e61bddf3a
parent 2379f87eb48a4ee6a1d0fc7df964e12a3efe4fd5

patch 8.2.2515: memory access error when truncating an empty message

Problem:    Memory access error when truncating an empty message.
Solution:   Check for an empty string. (Dominique Pellé, closes #7841)

src/message.c

diff --git a/src/message.c b/src/message.c
index 8adc224..012811f 100644
--- a/src/message.c
+++ b/src/message.c
@@ -248,6 +248,13 @@
     int		i;
     int		n;
 
+    if (*s == NUL)
+    {
+	if (buflen > 0)
+	    *buf = NUL;
+	return;
+    }
+
     if (room_in < 3)
 	room = 0;
     half = room / 2;