meson_drv_unbind() doesn't unregister the IRQ handler, which can lead to use-after-free if the IRQ fires after unbind:
[ 64.656876] Unable to handle kernel paging request at virtual address ffff000011706dbc ... [ 64.662001] pc : meson_irq+0x18/0x30 [meson_drm]
I'm assuming that a similar problem could happen on the error path of bind(), so uninstall the IRQ handler there as well.
Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller") Signed-off-by: Jean-Philippe Brucker jean-philippe.brucker@arm.com --- drivers/gpu/drm/meson/meson_drv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c index 7e85802c5398..8a4ebcb6405c 100644 --- a/drivers/gpu/drm/meson/meson_drv.c +++ b/drivers/gpu/drm/meson/meson_drv.c @@ -337,12 +337,14 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
ret = drm_dev_register(drm, 0); if (ret) - goto free_drm; + goto uninstall_irq;
drm_fbdev_generic_setup(drm, 32);
return 0;
+uninstall_irq: + drm_irq_uninstall(drm); free_drm: drm_dev_put(drm);
@@ -367,6 +369,7 @@ static void meson_drv_unbind(struct device *dev) }
drm_dev_unregister(drm); + drm_irq_uninstall(drm); drm_kms_helper_poll_fini(drm); drm_mode_config_cleanup(drm); drm_dev_put(drm);