This is a note to let you know that I've just added the patch titled
drm/vmwgfx: Potential off by one in vmw_view_add()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-vmwgfx-potential-off-by-one-in-vmw_view_add.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0d9cac0ca0429830c40fe1a4e50e60f6221fd7b6 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wed, 10 Jan 2018 12:40:04 +0300
Subject: drm/vmwgfx: Potential off by one in vmw_view_add()
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 0d9cac0ca0429830c40fe1a4e50e60f6221fd7b6 upstream.
The vmw_view_cmd_to_type() function returns vmw_view_max (3) on error.
It's one element beyond the end of the vmw_view_cotables[] table.
My read on this is that it's possible to hit this failure. header->id
comes from vmw_cmd_check() and it's a user controlled number between
1040 and 1225 so we can hit that error. But I don't have the hardware
to test this code.
Fixes: d80efd5cb3de ("drm/vmwgfx: Initial DX support")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2678,6 +2678,8 @@ static int vmw_cmd_dx_view_define(struct
}
view_type = vmw_view_cmd_to_type(header->id);
+ if (view_type == vmw_view_max)
+ return -EINVAL;
cmd = container_of(header, typeof(*cmd), header);
ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
user_surface_converter,
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-4.4/drm-vmwgfx-potential-off-by-one-in-vmw_view_add.patch