Patch "drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl" has been added to the 4.14-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-radeon-fix-race-condition-uaf-in-radeon_gem_set_.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 450645d76b6b89cb7a8431b51e1535ed9ea80573
Author: Min Li <lm0963hack@xxxxxxxxx>
Date:   Sat Jun 3 15:43:45 2023 +0800

    drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl
    
    [ Upstream commit 982b173a6c6d9472730c3116051977e05d17c8c5 ]
    
    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.
    
    Reviewed-by: Christian König <christian.koenig@xxxxxxx>
    Signed-off-by: Min Li <lm0963hack@xxxxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index ac467b80edc7c..59ad0a4e2fd53 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -376,7 +376,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 	struct radeon_device *rdev = dev->dev_private;
 	struct drm_radeon_gem_set_domain *args = data;
 	struct drm_gem_object *gobj;
-	struct radeon_bo *robj;
 	int r;
 
 	/* for now if someone requests domain CPU -
@@ -389,13 +388,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data,
 		up_read(&rdev->exclusive_lock);
 		return -ENOENT;
 	}
-	robj = gem_to_radeon_bo(gobj);
 
 	r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain);
 
 	drm_gem_object_put_unlocked(gobj);
 	up_read(&rdev->exclusive_lock);
-	r = radeon_gem_handle_lockup(robj->rdev, r);
+	r = radeon_gem_handle_lockup(rdev, r);
 	return r;
 }
 



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