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vnc: fix segfault

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Commit "c7628bf vnc: only alloc server surface with clients connected"
missed one rarely used codepath (cirrus with guest drivers using 2d
accel) where we have to check for the server surface being present,
to avoid qemu crashing with a NULL pointer dereference.  Add the check.

Reported-by: Anthony PERARD <anthony.perard@citrix.com>
Tested-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2015-11-25 08:04:05 +01:00
parent 4b6eda626f
commit 7fe4a41c26
1 changed files with 5 additions and 0 deletions
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5
ui/vnc.c
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@ -931,6 +931,11 @@ static void vnc_dpy_copy(DisplayChangeListener *dcl,
int i, x, y, pitch, inc, w_lim, s;
int cmp_bytes;
if (!vd->server) {
/* no client connected */
return;
}
vnc_refresh_server_surface(vd);
QTAILQ_FOREACH_SAFE(vs, &vd->clients, next, vn) {
if (vnc_has_feature(vs, VNC_FEATURE_COPYRECT)) {