Our internal structure that stores the DRM entities structure is allocated through a device-managed kzalloc. This means that this will eventually be freed whenever the device is removed. In our case, the most likely source of removal is that the main device is going to be unbound, and component_unbind_all() is being run. However, it occurs while the DRM device is still registered, which will create dangling pointers, eventually resulting in use-after-free. Switch to a DRM-managed allocation to keep our structure until the DRM driver doesn't need it anymore. Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx> --- drivers/gpu/drm/vc4/vc4_crtc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index bcce61879d53..d5158a6c0f21 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -1284,7 +1284,7 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data) struct drm_crtc *crtc; int ret; - vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL); + vc4_crtc = drmm_kzalloc(drm, sizeof(*vc4_crtc), GFP_KERNEL); if (!vc4_crtc) return -ENOMEM; crtc = &vc4_crtc->base; -- 2.36.1
