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screenshot: Extend ScreenshotArea parameter validation

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We currently only ensure that width and height are positive, so it
is still possible to pass in values that don't make any sense at all
(which may even result in a crash when exceeding limits imposed by
X11).
There is nothing to screenshot outside the actual screen area, so
restrict the parameters to that.

https://bugzilla.gnome.org/show_bug.cgi?id=699752
This commit is contained in:
Florian Müllner 2013-11-04 11:14:44 +01:00
parent cac32dfe2a
commit 3ac7bf874c
1 changed files with 3 additions and 1 deletions
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4
js/ui/screenshot.js
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@ -77,7 +77,9 @@ const ScreenshotService = new Lang.Class({
ScreenshotAreaAsync : function (params, invocation) {
let [x, y, width, height, flash, filename, callback] = params;
if (height <= 0 || width <= 0) {
if (x < 0 || y < 0 ||
width <= 0 || height <= 0 ||
x + width > global.screen_width || y + height > global.screen_height) {
invocation.return_error_literal(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED,
"Invalid params");
return;