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

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>
Cc: stable@vger.kernel.org
This commit is contained in:
Thomas Hellstrom 2016-10-10 10:51:24 -07:00 committed by Sinclair Yeh
parent 728c3b5399
commit 51ab70bed9
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
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@ -3891,14 +3891,14 @@ 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);