linux-kernel - [PATCH 5.10 637/717] drm/amd/display: Fix memory leaks in S3 resume

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Date:   Mon, 28 Dec 2020 13:50:35 +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, Harry Wentland <harry.wentland@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Stylon Wang <stylon.wang@....com>
Subject: [PATCH 5.10 637/717] drm/amd/display: Fix memory leaks in S3 resume

From: Stylon Wang <stylon.wang@....com>

commit a135a1b4c4db1f3b8cbed9676a40ede39feb3362 upstream.

EDID parsing in S3 resume pushes new display modes
to probed_modes list but doesn't consolidate to actual
mode list. This creates a race condition when
amdgpu_dm_connector_ddc_get_modes() re-initializes the
list head without walking the list and results in  memory leak.

Bug: https://bugzilla.kernel.org/show_bug.cgi?id=209987
Acked-by: Harry Wentland <harry.wentland@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Signed-off-by: Stylon Wang <stylon.wang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2278,7 +2278,8 @@ void amdgpu_dm_update_connector_after_de
 
 			drm_connector_update_edid_property(connector,
 							   aconnector->edid);
-			drm_add_edid_modes(connector, aconnector->edid);
+			aconnector->num_modes = drm_add_edid_modes(connector, aconnector->edid);
+			drm_connector_list_update(connector);
 
 			if (aconnector->dc_link->aux_mode)
 				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,