From 56abffb4b67f235d20de30f29ba027ab34c171e3 Mon Sep 17 00:00:00 2001 From: sin 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]);