linux-kernel - [PATCH 4.19 33/44] drm/nouveau/kms: Fix memory leak in nv50_mstm

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Message-Id: <20181218163931.324359708@linuxfoundation.org>
Date:   Tue, 18 Dec 2018 17:39:45 +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, Lyude Paul <lyude@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: [PATCH 4.19 33/44] drm/nouveau/kms: Fix memory leak in nv50_mstm_del()

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lyude Paul <lyude@...hat.com>

commit 24199c5436f267399afed0c4f1f57663c0408f57 upstream.

Noticed this while working on redoing the reference counting scheme in
the DP MST helpers. Nouveau doesn't attempt to call
drm_dp_mst_topology_mgr_destroy() at all, which leaves it leaking all of
the resources for drm_dp_mst_topology_mgr and it's children mstbs+ports.

Fixes: f479c0ba4a17 ("drm/nouveau/kms/nv50: initial support for DP 1.2 multi-stream")
Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: <stable@...r.kernel.org> # v4.10+
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/nouveau/dispnv50/disp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1226,6 +1226,7 @@ nv50_mstm_del(struct nv50_mstm **pmstm)
 {
 	struct nv50_mstm *mstm = *pmstm;
 	if (mstm) {
+		drm_dp_mst_topology_mgr_destroy(&mstm->mgr);
 		kfree(*pmstm);
 		*pmstm = NULL;
 	}