linux-kernel - [PATCH 5.19 052/192] drm/amd/display: fix memory leak when using debugfs

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Message-Id: <20220913140412.529529553@linuxfoundation.org>
Date:   Tue, 13 Sep 2022 16:02:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <Wayne.Lin@....com>,
        hersen wu <hersenxs.wu@....com>,
        Wenjing Liu <wenjing.liu@....com>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        Thelford Williams <tdwilliamsiv@...il.com>,
        Fangzhi Zuo <Jerry.Zuo@....com>,
        Yongzhi Liu <lyz_cs@....edu.cn>,
        Mikita Lipski <mikita.lipski@....com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Bhanuprakash Modem <bhanuprakash.modem@...el.com>,
        Sean Paul <seanpaul@...omium.org>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH 5.19 052/192] drm/amd/display: fix memory leak when using debugfs_lookup()

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit cbfac7fa491651c57926c99edeb7495c6c1aeac2 upstream.

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  Fix this up by properly
calling dput().

Cc: Harry Wentland <harry.wentland@....com>
Cc: Leo Li <sunpeng.li@....com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Wayne Lin <Wayne.Lin@....com>
Cc: hersen wu <hersenxs.wu@....com>
Cc: Wenjing Liu <wenjing.liu@....com>
Cc: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Cc: Thelford Williams <tdwilliamsiv@...il.com>
Cc: Fangzhi Zuo <Jerry.Zuo@....com>
Cc: Yongzhi Liu <lyz_cs@....edu.cn>
Cc: Mikita Lipski <mikita.lipski@....com>
Cc: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc: Bhanuprakash Modem <bhanuprakash.modem@...el.com>
Cc: Sean Paul <seanpaul@...omium.org>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Cc: stable@...r.kernel.org
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -3188,7 +3188,7 @@ void crtc_debugfs_init(struct drm_crtc *
 				   &crc_win_y_end_fops);
 	debugfs_create_file_unsafe("crc_win_update", 0644, dir, crtc,
 				   &crc_win_update_fops);
-
+	dput(dir);
 }
 #endif
 /*