From 193911af760d460198fc7f08bf6da824f74975b7 Mon Sep 17 00:00:00 2001 From: Thomas Martitz Date: Sun, 12 Jan 2014 17:31:53 +0100 Subject: put_line(): Fix buffer overflow. At the end of the format string it wrote a last byte (or inline string) past the end of the lcd boundaries, potentially overwriting unrelated memory. It now makes sure it won't exceed the viewport's width. Change-Id: Id4cfce918e8b070b7fc3c7d33f389f7a171963ff --- apps/gui/line.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'apps/gui') diff --git a/apps/gui/line.c b/apps/gui/line.c index fd35102ab0..5e22d6da26 100644 --- a/apps/gui/line.c +++ b/apps/gui/line.c @@ -184,6 +184,7 @@ static void print_line(struct screen *display, enum themable_icons icon; char tempbuf[MAX_PATH+32]; unsigned int tempbuf_idx; + int max_width = display->getwidth(); height = line->height == -1 ? display->getcharheight() : line->height; icon_h = get_icon_height(display->screen_type); @@ -195,7 +196,7 @@ static void print_line(struct screen *display, y += height/2 - display->getcharheight()/2; /* parse format string */ - while (1) + while (xpos < max_width) { ch = *fmt++; /* need to check for escaped '$' */ @@ -280,8 +281,9 @@ next: DEBUGF("%s ", ch ? "put_line: String truncated" : ""); } if (!ch) - { /* end of string. put it online */ - put_text(display, xpos, y, line, tempbuf, false, 0); + { /* end of format string. flush pending inline string, if any */ + if (tempbuf[0]) + put_text(display, xpos, y, line, tempbuf, false, 0); return; } else if (ch == '$') -- cgit v1.2.3