From: Stefan Weil <weil@mail.berlios.de>
To: qemu-devel@nongnu.org
Cc: Anthony Liguori <aliguori@us.ibm.com>
Subject: [Qemu-devel] [PATCH STABLE 0.14] vnc: Limit r/w access to size of allocated memory
Date: Tue, 15 Mar 2011 19:43:59 +0100 [thread overview]
Message-ID: <1300214639-5539-1-git-send-email-weil@mail.berlios.de> (raw)
This fixes memory reads and writes which exceeded the upper limit
of allocated memory vd->guest.ds->data and vd->server->data.
Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
---
ui/vnc.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/ui/vnc.c b/ui/vnc.c
index f4fea04..013f5e3 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2273,6 +2273,9 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
*/
vnc_set_bits(width_mask, (ds_get_width(vd->ds) / 16), VNC_DIRTY_WORDS);
cmp_bytes = 16 * ds_get_bytes_per_pixel(vd->ds);
+ if (cmp_bytes > vd->ds->surface->linesize) {
+ cmp_bytes = vd->ds->surface->linesize;
+ }
guest_row = vd->guest.ds->data;
server_row = vd->server->data;
for (y = 0; y < vd->guest.ds->height; y++) {
--
1.7.0.4
reply other threads:[~2011-03-15 18:44 UTC|newest]
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