shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

drm/vmwgfx: Limit the user-space command buffer size

Browse Source 
commit 51ab70bed9 upstream.

With older hardware versions, the user could specify arbitrarily large
command buffer sizes, causing a vmalloc / vmap space exhaustion.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Hellstrom
2016-10-10 10:51:24 -07:00
committed by Greg Kroah-Hartman
parent 78f2cffcdb
commit edd2b5fd02
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
View File

@@ -3830,14 +3830,14 @@ static void *vmw_execbuf_cmdbuf(struct vmw_private *dev_priv,
int ret;
*header = NULL;
if (!dev_priv->cman || kernel_commands)
return kernel_commands;
if (command_size > SVGA_CB_MAX_SIZE) {
DRM_ERROR("Command buffer is too large.\n");
return ERR_PTR(-EINVAL);
}
if (!dev_priv->cman || kernel_commands)
return kernel_commands;
/* If possible, add a little space for fencing. */
cmdbuf_size = command_size + 512;
cmdbuf_size = min_t(size_t, cmdbuf_size, SVGA_CB_MAX_SIZE);