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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2016-06-20 19:53:33 +0100 |
|---|---|---|
| committer |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-06-20 21:20:16 +0200 |
| commit | e4245ea898797f606cf2260c9c1970414b96af78 (patch) | |
| tree | 8b3538d0384afab78c6799f497f304f6bf07d7fb /drivers/gpu/drm/drm_info.c | |
| parent | drm: fix send_vblank_event use-after-free error (diff) | |
| download | linux-dev-e4245ea898797f606cf2260c9c1970414b96af78.tar.xz linux-dev-e4245ea898797f606cf2260c9c1970414b96af78.zip | |
drm: Prevent NULL deref in drm_name_info()
If a driver does not have a parent, or never sets the unique name for
itself, then we may proceed to chase a NULL dereference through
debugfs/.../name.
Testcase: igt/vgem_basic/debugfs
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466448813-23340-1-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/drm_info.c')
| -rw-r--r-- | drivers/gpu/drm/drm_info.c | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c index 0090d5987801..e2d2543d5bd0 100644 --- a/drivers/gpu/drm/drm_info.c +++ b/drivers/gpu/drm/drm_info.c @@ -51,17 +51,16 @@ int drm_name_info(struct seq_file *m, void *data) struct drm_minor *minor = node->minor; struct drm_device *dev = minor->dev; struct drm_master *master = minor->master; - if (!master) - return 0; - - if (master->unique) { - seq_printf(m, "%s %s %s\n", - dev->driver->name, - dev_name(dev->dev), master->unique); - } else { - seq_printf(m, "%s %s\n", - dev->driver->name, dev_name(dev->dev)); - } + + seq_printf(m, "%s", dev->driver->name); + if (dev->dev) + seq_printf(m, " dev=%s", dev_name(dev->dev)); + if (master && master->unique) + seq_printf(m, " master=%s", master->unique); + if (dev->unique) + seq_printf(m, " unique=%s", dev->unique); + seq_printf(m, "\n"); + return 0; } |