4.20-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Hellstrom thellstrom@vmware.com
commit 51fdbeb4ca1a8415c98f87cb877956ae83e71627 upstream.
if vmw_execbuf_fence_commands() fails, The handle value will be uninitialized and a bogus fence handle might be copied to user-space.
Cc: stable@vger.kernel.org Fixes: 2724b2d54cda: ("drm/vmwgfx: Use new validation interface for the modesetting code v2") Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Brian Paul brianp@vmware.com #v1 Reviewed-by: Sinclair Yeh syeh@vmware.com #v1 Reviewed-by: Deepak Rawat drawat@vmware.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -2592,8 +2592,8 @@ void vmw_kms_helper_validation_finish(st user_fence_rep) { struct vmw_fence_obj *fence = NULL; - uint32_t handle; - int ret; + uint32_t handle = 0; + int ret = 0;
if (file_priv || user_fence_rep || vmw_validation_has_bos(ctx) || out_fence)