From 56abffb4b67f235d20de30f29ba027ab34c171e3 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Wed, 15 Apr 2015 09:43:06 +0100
Subject: [PATCH] Fix memmove() invocation with src/dst being NULL
This fixes a segmentation fault on some systems.
---
st.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/st.c b/st.c
index b1d3791..bb8c365 100644
--- a/st.c
+++ b/st.c
@@ -2788,8 +2788,11 @@ tresize(int col, int row) {
free(term.line[i]);
free(term.alt[i]);
}
- memmove(term.line, term.line + i, row * sizeof(Line));
- memmove(term.alt, term.alt + i, row * sizeof(Line));
+ /* ensure that both src and dst are not NULL */
+ if (i > 0) {
+ memmove(term.line, term.line + i, row * sizeof(Line));
+ memmove(term.alt, term.alt + i, row * sizeof(Line));
+ }
for(i += row; i < term.row; i++) {
free(term.line[i]);
free(term.alt[i]);