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drm: Prevent NULL deref in drm_name_info()

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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
This commit is contained in:
Chris Wilson 2016-06-20 19:53:33 +01:00 committed by Daniel Vetter
parent c001da4f7c
commit e4245ea898
1 changed files with 9 additions and 10 deletions
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19
drivers/gpu/drm/drm_info.c
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@ -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;
}