[PATCH] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl

[Min Li]

Userspace can race to free the gobj(robj converted from), robj should not
be accessed again after drm_gem_object_put, otherwith it will result in
use-after-free.

Signed-off-by: Min Li <lm0963h...@gmail.com>
---
 drivers/gpu/drm/radeon/radeon_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_gem.c 
b/drivers/gpu/drm/radeon/radeon_gem.c
index bdc5af23f005..450c7cbdd28a 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -478,7 +478,7 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, 
void *data,
 
        drm_gem_object_put(gobj);
        up_read(&rdev->exclusive_lock);
-       r = radeon_gem_handle_lockup(robj->rdev, r);
+       r = radeon_gem_handle_lockup(rdev, r);
        return r;
 }
 
-- 
2.34.1