File 0173-vnc-sanitize-bits_per_pixel-from-th.patch of Package qemu.2059

Overview Repositories Revisions Requests Users Attributes Meta

File 0173-vnc-sanitize-bits_per_pixel-from-th.patch of Package qemu.2059

From 29da57657334bfc2cb51059be8a0f71d2dff7cc6 Mon Sep 17 00:00:00 2001
From: Petr Matousek <pmatouse@redhat.com>
Date: Mon, 27 Oct 2014 12:41:44 +0100
Subject: [PATCH] vnc: sanitize bits_per_pixel from the client
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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)
[AF: BSC#902737]
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
 ui/vnc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ui/vnc.c b/ui/vnc.c
index 6cb2288..8393c54 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2044,6 +2044,16 @@ static void set_pixel_format(VncState *vs,
         blue_shift = 6;
     }
 
+    switch (bits_per_pixel) {
+    case 8:
+    case 16:
+    case 32:
+        break;
+    default:
+        vnc_client_error(vs);
+        return;
+    }
+
     vs->client_pf.rmax = red_max;
     vs->client_pf.rbits = hweight_long(red_max);
     vs->client_pf.rshift = red_shift;

Places

File 0173-vnc-sanitize-bits_per_pixel-from-th.patch of Package qemu.2059

Places