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From b7484c224738247b510ed0d268cd577076958f1b Mon Sep 17 00:00:00 2001
From: Kuang-che Wu <kcwu@csie.org>
Date: Mon, 31 Aug 2015 17:49:57 +0000
Subject: Fix stack overflow due to too deep recursion
Bug: 45713
How to reproduce:
Run this command inside screen
$ printf '\x1b[10000000T'
screen will recursively call MScrollV to depth n/256. This is time consuming and will overflow stack if n is huge.
---
diff --git a/src/ansi.c b/src/ansi.c
index a342fb1..152d2ef 100644
--- ansi.c
+++ ansi.c
@@ -2502,13 +2502,13 @@ int n, ys, ye, bce;
return;
if (n > 0)
{
+ if (ye - ys + 1 < n)
+ n = ye - ys + 1;
if (n > 256)
{
MScrollV(p, n - 256, ys, ye, bce);
n = 256;
}
- if (ye - ys + 1 < n)
- n = ye - ys + 1;
#ifdef COPY_PASTE
if (compacthist)
{
@@ -2562,14 +2562,14 @@ int n, ys, ye, bce;
}
else
{
- if (n < -256)
- {
- MScrollV(p, n + 256, ys, ye, bce);
- n = -256;
- }
n = -n;
if (ye - ys + 1 < n)
n = ye - ys + 1;
+ if (n > 256)
+ {
+ MScrollV(p, - (n - 256), ys, ye, bce);
+ n = 256;
+ }
ml = p->w_mlines + ye;
/* Clear lines */
--
cgit v0.9.0.2
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