From: Thomas Hellstrom <thellstrom@vmware.com>
Date: Thu, 31 Jan 2019 09:55:37 +0000 (+0100)
Subject: drm/vmwgfx: Return error code from vmw_execbuf_copy_fence_user
X-Git-Tag: v4.9.157~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3ced0ff7ec99b661466b7725bb98e2a618bc5c5;p=thirdparty%2Fkernel%2Fstable.git

drm/vmwgfx: Return error code from vmw_execbuf_copy_fence_user

commit 728354c005c36eaf44b6e5552372b67e60d17f56 upstream.

The function was unconditionally returning 0, and a caller would have to
rely on the returned fence pointer being NULL to detect errors. However,
the function vmw_execbuf_copy_fence_user() would expect a non-zero error
code in that case and would BUG otherwise.

So make sure we return a proper non-zero error code if the fence pointer
returned is NULL.

Cc: <stable@vger.kernel.org>
Fixes: ae2a104058e2: ("vmwgfx: Implement fence objects")
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 81f5a552e32f7..9fe8eda7c859c 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3769,7 +3769,7 @@ int vmw_execbuf_fence_commands(struct drm_file *file_priv,
 		*p_fence = NULL;
 	}
 
-	return 0;
+	return ret;
 }
 
 /**