st

commit 56abffb4b67f235d20de30f29ba027ab34c171e3
parent aff35af275cb82eb876630c9256298ea1d1b2b57
Author: sin <sin@2f30.org>
Date:   Wed, 15 Apr 2015 09:43:06 +0100

Fix memmove() invocation with src/dst being NULL

This fixes a segmentation fault on some systems.

Diffstat:
st.c
 | 
7
+++++--

1 file changed, 5 insertions(+), 2 deletions(-)
diff --git 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]);