From: sin <sin@2f30.org>
Date: Wed, 15 Apr 2015 08:43:06 +0000 (+0100)
Subject: Fix memmove() invocation with src/dst being NULL
X-Git-Url: https://git.danieliu.xyz/?a=commitdiff_plain;h=56abffb4b67f235d20de30f29ba027ab34c171e3;p=st.git

Fix memmove() invocation with src/dst being NULL

This fixes a segmentation fault on some systems.
---

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]);