From: noname <noname@inventati.org>
Date: Tue, 22 Apr 2014 22:08:13 +0000 (+0400)
Subject: Simplify tdeletechar and tinsertblank and fix memory corruption.
X-Git-Url: https://git.owens.tech/assets/lich_lifts_title_slice.png%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%A0%22Lich%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%82%C2%83%C3%83%C2%83%C3%82%C2%82%C3%83%C2%82%C3%82%C2%82%C3%83%C2%83%C3%82%C2%83%C3%83%C2%82%C3%8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Simplify tdeletechar and tinsertblank and fix memory corruption.

Current CSI parsing code uses strtol to parse arguments and allows them
to be negative. Negative argument is not properly handled in tdeletechar
and tinsertblank and results in memory corruption in memmove.

Reproduce with printf '\e[-500@'

Patch also removes special handling for corner case and simplifies
the code.

Removed
	term.dirty[term.c.y] = 1
because tclearregion sets dirty flag.
---

diff --git a/st.c b/st.c
index 60243a7..263abaa 100644
--- a/st.c
+++ b/st.c
@@ -1586,37 +1586,31 @@ tclearregion(int x1, int y1, int x2, int y2) {
 
 void
 tdeletechar(int n) {
-	int src = term.c.x + n;
-	int dst = term.c.x;
-	int size = term.col - src;
+	int dst, src, size;
 
-	term.dirty[term.c.y] = 1;
+	LIMIT(n, 0, term.col - term.c.x);
 
-	if(src >= term.col) {
-		tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
-		return;
-	}
+	dst = term.c.x;
+	src = term.c.x + n;
+	size = term.col - src;
 
 	memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-			size * sizeof(Glyph));
+	        size * sizeof(Glyph));
 	tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
 }
 
 void
 tinsertblank(int n) {
-	int src = term.c.x;
-	int dst = src + n;
-	int size = term.col - dst;
+	int dst, src, size;
 
-	term.dirty[term.c.y] = 1;
+	LIMIT(n, 0, term.col - term.c.x);
 
-	if(dst >= term.col) {
-		tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
-		return;
-	}
+	dst = term.c.x + n;
+	src = term.c.x;
+	size = term.col - dst;
 
 	memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
-			size * sizeof(Glyph));
+	        size * sizeof(Glyph));
 	tclearregion(src, term.c.y, dst - 1, term.c.y);
 }