linux-kernel - [PATCH] drm/lease: fix WARNING in idr

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Message-Id: <1584329768-16119-1-git-send-email-hqjagain@gmail.com>
Date:   Mon, 16 Mar 2020 11:36:08 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Qiujun Huang <hqjagain@...il.com>
Subject: [PATCH] drm/lease: fix WARNING in idr_destroy

leases has been destroyed:
drm_master_put
    ->drm_master_destroy
            ->idr_destroy

so the "out_lessee" needn't to call idr_destroy again.

Reported-and-tested-by: syzbot+05835159fe322770fe3d@...kaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@...il.com>
---
 drivers/gpu/drm/drm_lease.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_lease.c b/drivers/gpu/drm/drm_lease.c
index b481caf..54506c2 100644
--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -577,11 +577,14 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
 
 out_lessee:
 	drm_master_put(&lessee);
+	goto err_exit;
 
 out_leases:
-	put_unused_fd(fd);
 	idr_destroy(&leases);
 
+err_exit:
+	put_unused_fd(fd);
+
 	DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
 	return ret;
 }
-- 
1.8.3.1