[Qemu-stable] [PATCH 50/88] vnc: sanitize bits_per_pixel from the client

[Michael Roth]

From: Petr Matousek <address@hidden>

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 <address@hidden>

[ kraxel: apply codestyle fix ]

Signed-off-by: Gerd Hoffmann <address@hidden>
(cherry picked from commit e6908bfe8e07f2b452e78e677da1b45b1c0f6829)
Signed-off-by: Michael Roth <address@hidden>
---
 ui/vnc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ui/vnc.c b/ui/vnc.c
index f8d9b7d..87e34ae 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2026,6 +2026,16 @@ 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->client_pf.rmax = red_max;
     vs->client_pf.rbits = hweight_long(red_max);
     vs->client_pf.rshift = red_shift;
-- 
1.9.1