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.
Reviewed-by: Dave Stevenson dave.stevenson@raspberrypi.com Signed-off-by: Maxime Ripard maxime@cerno.tech --- 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 188cf25125f0..dadf962b0bb5 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -1279,7 +1279,7 @@ 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;