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hw/xwin: Improve NET_WM_ICON validation

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Check that we don't overrun the end of the property data while converting icons

See http://cygwin.com/ml/cygwin-xfree/2013-06/msg00040.html for testcase.

Also, some warning fixes in winXIconToHICON()

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
This commit is contained in:
Jon TURNEY 2013-06-16 13:55:51 +01:00
parent ab61d07002
commit 896b53ffa7
1 changed files with 20 additions and 6 deletions
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26
hw/xwin/winmultiwindowicons.c
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@ -372,13 +372,12 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
unsigned char *mask, *image = NULL, *imageMask;
unsigned char *dst, *src;
int planes, bpp, i;
int biggest_size = 0;
unsigned int biggest_size = 0;
HDC hDC;
ICONINFO ii;
XWMHints *hints;
HICON hIcon = NULL;
uint32_t *biggest_icon = NULL;
static Atom _XA_NET_WM_ICON;
static int generation;
uint32_t *icon, *icon_data = NULL;
@ -405,10 +404,25 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
(icon_data != NULL)) {
for (icon = icon_data; icon < &icon_data[size] && *icon;
icon = &icon[icon[0] * icon[1] + 2]) {
/* Find an exact match to the size we require... */
winDebug("winXIconToHICON: %u x %u NetIcon\n", icon[0], icon[1]);
/* Icon data size will overflow an int and thus is bigger than the
property can possibly be */
if ((INT_MAX/icon[0]) < icon[1]) {
winDebug("winXIconToHICON: _NET_WM_ICON icon data size overflow\n");
break;
}
/* Icon data size is bigger than amount of data remaining */
if (&icon[icon[0] * icon[1] + 2] > &icon_data[size]) {
winDebug("winXIconToHICON: _NET_WM_ICON data is malformed\n");
break;
}
/* Found an exact match to the size we require... */
if (icon[0] == iconSize && icon[1] == iconSize) {
winDebug("winXIconToHICON: found %lu x %lu NetIcon\n", icon[0],
icon[1]);
winDebug("winXIconToHICON: selected %d x %d NetIcon\n",
iconSize, iconSize);
hIcon = NetWMToWinIcon(bpp, icon);
break;
}
@ -421,7 +435,7 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
if (!hIcon && biggest_icon) {
winDebug
("winXIconToHICON: selected %lu x %lu NetIcon for scaling to %u x %u\n",
("winXIconToHICON: selected %u x %u NetIcon for scaling to %d x %d\n",
biggest_icon[0], biggest_icon[1], iconSize, iconSize);
hIcon = NetWMToWinIcon(bpp, biggest_icon);