The assignment of handle in vmw_framebuffer_create_handle doesn't actually do anything useful and is incorrectly assigning an integer value to a pointer argument. It appears that this is a typo and should be dereferencing handle rather than assigning to it directly. This fixes a bug where an undefined handle value is potentially returned to user-space.

Signed-off-by: Ryan Mallon rmallon@gmail.com Reviewed-by: Jakob Bornecrantzjakob@vmware.com Cc: stable@vger.kernel.org --- Thomas and Jakob have said that a correct fix involves returning the correct user_handle, but also requires changes to userspace. This patch is therefore a temporary fix only. Because it corrects an undefined handle value being returned to userspace, this should also be merged for stable kernels.

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c index 0af6ebd..b66ef0e 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c @@ -378,7 +378,7 @@ int vmw_framebuffer_create_handle(struct drm_framebuffer *fb, unsigned int *handle) { if (handle) - handle = 0; + *handle = 0;

return 0; }