The call to ttm_eu_backoff_reservation() as part of an error path would cause a lock imbalance if the reservation ticket was not initialized. This error is easily triggered from user-space by submitting a bogus command stream.
Signed-off-by: Thomas Hellstrom thellstrom@vmware.com Reviewed-by: Jakob Bornecrantz jakob@vmware.com Cc: stable@vger.kernel.org Cc: Maarten Lankhorst maarten.lankhorst@canonical.com Cc: Jerome Glisse jglisse@redhat.com Cc: Dave Airlie airlied@redhat.com --- drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c index 3f0b4d1..dafa139 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c @@ -2195,11 +2195,11 @@ int vmw_execbuf_process(struct drm_file *file_priv, ret = vmw_cmd_check_all(dev_priv, sw_context, kernel_commands, command_size); if (unlikely(ret != 0)) - goto out_err; + goto out_err_nores;
ret = vmw_resources_reserve(sw_context); if (unlikely(ret != 0)) - goto out_err; + goto out_err_nores;
ret = ttm_eu_reserve_buffers(&ticket, &sw_context->validate_nodes); if (unlikely(ret != 0)) @@ -2291,10 +2291,11 @@ int vmw_execbuf_process(struct drm_file *file_priv, out_unlock_binding: mutex_unlock(&dev_priv->binding_mutex); out_err: - vmw_resource_relocations_free(&sw_context->res_relocations); - vmw_free_relocations(sw_context); ttm_eu_backoff_reservation(&ticket, &sw_context->validate_nodes); +out_err_nores: vmw_resource_list_unreserve(&sw_context->resource_list, true); + vmw_resource_relocations_free(&sw_context->res_relocations); + vmw_free_relocations(sw_context); vmw_clear_validations(sw_context); if (unlikely(dev_priv->pinned_bo != NULL && !dev_priv->query_cid_valid))