From ce3e14175ea36d851aede808fc8891313b91ec27 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Mon, 14 Jun 2010 12:28:23 +0200 Subject: Fix vnc memory corruption with width = 1400 vnc assumes that the screen width is a multiple of 16 in several places. If this is not the case vnc will overrun buffers, corrupt memory, make qemu crash. This is the minimum fix for this bug. It makes sure we don't overrun the scanline, thereby fixing the segfault. The rendering is *not* correct though, there is a black border at the right side of the screen, 8 pixels wide because 1400 % 16 == 8. Signed-off-by: Gerd Hoffmann --- ui/vnc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'ui') diff --git a/ui/vnc.c b/ui/vnc.c index 16b79ec..5752bf8 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -2445,7 +2445,7 @@ static int vnc_refresh_server_surface(VncDisplay *vd) guest_ptr = guest_row; server_ptr = server_row; - for (x = 0; x < vd->guest.ds->width; + for (x = 0; x + 15 < vd->guest.ds->width; x += 16, guest_ptr += cmp_bytes, server_ptr += cmp_bytes) { if (!test_and_clear_bit((x / 16), vd->guest.dirty[y])) continue; -- cgit v1.1