linux-kernel - [PATCH 4.19 46/65] drm/lease: fix WARNING in idr

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Date:   Tue, 24 Mar 2020 14:11:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Qiujun Huang <hqjagain@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        syzbot+05835159fe322770fe3d@...kaller.appspotmail.com
Subject: [PATCH 4.19 46/65] drm/lease: fix WARNING in idr_destroy

From: Qiujun Huang <hqjagain@...il.com>

commit b216a8e7908cd750550c0480cf7d2b3a37f06954 upstream.

drm_lease_create takes ownership of leases. And leases will be released
by drm_master_put.

drm_master_put
    ->drm_master_destroy
            ->idr_destroy

So we needn't call idr_destroy again.

Reported-and-tested-by: syzbot+05835159fe322770fe3d@...kaller.appspotmail.com
Signed-off-by: Qiujun Huang <hqjagain@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1584518030-4173-1-git-send-email-hqjagain@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/drm_lease.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_lease.c
+++ b/drivers/gpu/drm/drm_lease.c
@@ -545,10 +545,12 @@ int drm_mode_create_lease_ioctl(struct d
 	}
 
 	DRM_DEBUG_LEASE("Creating lease\n");
+	/* lessee will take the ownership of leases */
 	lessee = drm_lease_create(lessor, &leases);
 
 	if (IS_ERR(lessee)) {
 		ret = PTR_ERR(lessee);
+		idr_destroy(&leases);
 		goto out_leases;
 	}
 
@@ -583,7 +585,6 @@ out_lessee:
 
 out_leases:
 	put_unused_fd(fd);
-	idr_destroy(&leases);
 
 	DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl failed: %d\n", ret);
 	return ret;