hw/xwin: Improve NET_WM_ICON validation
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>
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@ -372,13 +372,12 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
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unsigned char *mask, *image = NULL, *imageMask;
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unsigned char *dst, *src;
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int planes, bpp, i;
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int biggest_size = 0;
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unsigned int biggest_size = 0;
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HDC hDC;
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ICONINFO ii;
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XWMHints *hints;
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HICON hIcon = NULL;
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uint32_t *biggest_icon = NULL;
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static Atom _XA_NET_WM_ICON;
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static int generation;
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uint32_t *icon, *icon_data = NULL;
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@ -405,10 +404,25 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
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(icon_data != NULL)) {
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for (icon = icon_data; icon < &icon_data[size] && *icon;
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icon = &icon[icon[0] * icon[1] + 2]) {
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/* Find an exact match to the size we require... */
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winDebug("winXIconToHICON: %u x %u NetIcon\n", icon[0], icon[1]);
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/* Icon data size will overflow an int and thus is bigger than the
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property can possibly be */
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if ((INT_MAX/icon[0]) < icon[1]) {
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winDebug("winXIconToHICON: _NET_WM_ICON icon data size overflow\n");
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break;
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}
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/* Icon data size is bigger than amount of data remaining */
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if (&icon[icon[0] * icon[1] + 2] > &icon_data[size]) {
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winDebug("winXIconToHICON: _NET_WM_ICON data is malformed\n");
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break;
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}
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/* Found an exact match to the size we require... */
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if (icon[0] == iconSize && icon[1] == iconSize) {
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winDebug("winXIconToHICON: found %lu x %lu NetIcon\n", icon[0],
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icon[1]);
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winDebug("winXIconToHICON: selected %d x %d NetIcon\n",
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iconSize, iconSize);
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hIcon = NetWMToWinIcon(bpp, icon);
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break;
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}
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@ -421,7 +435,7 @@ winXIconToHICON(Display * pDisplay, Window id, int iconSize)
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if (!hIcon && biggest_icon) {
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winDebug
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("winXIconToHICON: selected %lu x %lu NetIcon for scaling to %u x %u\n",
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("winXIconToHICON: selected %u x %u NetIcon for scaling to %d x %d\n",
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biggest_icon[0], biggest_icon[1], iconSize, iconSize);
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hIcon = NetWMToWinIcon(bpp, biggest_icon);
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