* [PATCH] drm/amdgpu/dm: Fix NULL pointer crash during DP MST hotplug
@ 2021-04-15 17:55 Shashank Sharma
2021-04-15 17:58 ` Harry Wentland
0 siblings, 1 reply; 2+ messages in thread
From: Shashank Sharma @ 2021-04-15 17:55 UTC (permalink / raw)
To: amd-gfx; +Cc: alexander.deucher, Harry Wentland, Shashank Sharma
This patch checks the return value of the function
dc_link_add_remote_sink before using it. This was causing
a crash during consecutive hotplugs of DP MST displays.
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index eee19edeeee5..8dc5005bec0a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -226,6 +226,11 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
(aconnector->edid->extensions + 1) * EDID_LENGTH,
&init_params);
+ if (!dc_sink) {
+ DRM_ERROR("Unable to add a remote sink\n");
+ return 0;
+ }
+
dc_sink->priv = aconnector;
/* dc_link_add_remote_sink returns a new reference */
aconnector->dc_sink = dc_sink;
--
2.25.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/amdgpu/dm: Fix NULL pointer crash during DP MST hotplug
2021-04-15 17:55 [PATCH] drm/amdgpu/dm: Fix NULL pointer crash during DP MST hotplug Shashank Sharma
@ 2021-04-15 17:58 ` Harry Wentland
0 siblings, 0 replies; 2+ messages in thread
From: Harry Wentland @ 2021-04-15 17:58 UTC (permalink / raw)
To: Shashank Sharma, amd-gfx; +Cc: alexander.deucher
On 2021-04-15 1:55 p.m., Shashank Sharma wrote:
> This patch checks the return value of the function
> dc_link_add_remote_sink before using it. This was causing
> a crash during consecutive hotplugs of DP MST displays.
>
> Cc: Harry Wentland <harry.wentland@amd.com>
> Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Harry
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index eee19edeeee5..8dc5005bec0a 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -226,6 +226,11 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
> (aconnector->edid->extensions + 1) * EDID_LENGTH,
> &init_params);
>
> + if (!dc_sink) {
> + DRM_ERROR("Unable to add a remote sink\n");
> + return 0;
> + }
> +
> dc_sink->priv = aconnector;
> /* dc_link_add_remote_sink returns a new reference */
> aconnector->dc_sink = dc_sink;
>
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