diff options
| author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-08-09 02:16:18 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2016-08-09 13:01:47 +1000 |
| commit | 36e9d08b58f44c3a02974c405ccaaa6ecfaf05b8 (patch) | |
| tree | 02e9bc0c84ac36db3b49c8be2620dc949f4195ad /drivers/gpu | |
| parent | 210a021dab639694600450c14b877bf3e3240adc (diff) | |
drm/cirrus: Fix NULL pointer dereference when registering the fbdev
cirrus_modeset_init() is initializing/registering the emulated fbdev
and, since commit c61b93fe51b1 ("drm/atomic: Fix remaining places where
!funcs->best_encoder is valid"), DRM internals can access/test some of
the fields in mode_config->funcs as part of the fbdev registration
process.
Make sure dev->mode_config.funcs is properly set to avoid dereferencing
a NULL pointer.
Reported-by: Mike Marshall <hubcap@omnibond.com>
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: c61b93fe51b1 ("drm/atomic: Fix remaining places where !funcs->best_encoder is valid")
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/cirrus/cirrus_main.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/gpu/drm/cirrus/cirrus_main.c b/drivers/gpu/drm/cirrus/cirrus_main.c index 80446e2d3ab6..76bcb43e7c06 100644 --- a/drivers/gpu/drm/cirrus/cirrus_main.c +++ b/drivers/gpu/drm/cirrus/cirrus_main.c @@ -185,14 +185,23 @@ int cirrus_driver_load(struct drm_device *dev, unsigned long flags) goto out; } + /* + * cirrus_modeset_init() is initializing/registering the emulated fbdev + * and DRM internals can access/test some of the fields in + * mode_config->funcs as part of the fbdev registration process. + * Make sure dev->mode_config.funcs is properly set to avoid + * dereferencing a NULL pointer. + * FIXME: mode_config.funcs assignment should probably be done in + * cirrus_modeset_init() (that's a common pattern seen in other DRM + * drivers). + */ + dev->mode_config.funcs = &cirrus_mode_funcs; r = cirrus_modeset_init(cdev); if (r) { dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r); goto out; } - dev->mode_config.funcs = (void *)&cirrus_mode_funcs; - return 0; out: cirrus_driver_unload(dev); |