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From 8b0f4f6e1bf67e200a0ec4922ae9bdbd27276ffc Mon Sep 17 00:00:00 2001
From: Petr Matousek <pmatouse@redhat.com>
Date: Mon, 27 Oct 2014 12:41:44 +0100
Subject: vnc: sanitize bits_per_pixel from the client
bits_per_pixel that are less than 8 could result in accessing
non-initialized buffers later in the code due to the expectation
that bytes_per_pixel value that is used to initialize these buffers is
never zero.
To fix this check that bits_per_pixel from the client is one of the
values that the rfb protocol specification allows.
This is CVE-2014-7815.
Signed-off-by: Petr Matousek <pmatouse@redhat.com>
[ kraxel: apply codestyle fix ]
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit e6908bfe8e07f2b452e78e677da1b45b1c0f6829)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---
ui/vnc.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/ui/vnc.c b/ui/vnc.c
index 54bc5ad..361b5e2 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1893,6 +1893,16 @@ static void set_pixel_format(VncState *vs,
return;
}
+ switch (bits_per_pixel) {
+ case 8:
+ case 16:
+ case 32:
+ break;
+ default:
+ vnc_client_error(vs);
+ return;
+ }
+
vs->clientds = *(vs->vd->guest.ds);
vs->clientds.pf.rmax = red_max;
vs->clientds.pf.rbits = hweight_long(red_max);
--
1.7.10.4
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