Patch "drm/amdgpu:fix virtual dce bug" has been added to the 4.14-stable tree

Patch "drm/amdgpu:fix virtual dce bug" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/amdgpu:fix virtual dce bug

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-fix-virtual-dce-bug.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Fri Mar 16 15:43:17 CET 2018
From: Monk Liu <Monk.Liu@amd.com>
Date: Wed, 15 Nov 2017 17:10:13 +0800
Subject: drm/amdgpu:fix virtual dce bug

From: Monk Liu <Monk.Liu@amd.com>


[ Upstream commit 129d65c18ecfb249aceb540c31fdaf79bd5a11ff ]

this fix the issue that access memory after freed
after driver unloaded.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/amd/amdgpu/dce_virtual.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c
@@ -437,6 +437,8 @@ static int dce_virtual_sw_fini(void *han
 	drm_kms_helper_poll_fini(adev->ddev);
 
 	drm_mode_config_cleanup(adev->ddev);
+	/* clear crtcs pointer to avoid dce irq finish routine access freed data */
+	memset(adev->mode_info.crtcs, 0, sizeof(adev->mode_info.crtcs[0]) * AMDGPU_MAX_CRTCS);
 	adev->mode_info.mode_config_initialized = false;
 	return 0;
 }
@@ -723,7 +725,7 @@ static void dce_virtual_set_crtc_vblank_
 							int crtc,
 							enum amdgpu_interrupt_state state)
 {
-	if (crtc >= adev->mode_info.num_crtc) {
+	if (crtc >= adev->mode_info.num_crtc || !adev->mode_info.crtcs[crtc]) {
 		DRM_DEBUG("invalid crtc %d\n", crtc);
 		return;
 	}


Patches currently in stable-queue which might be from Monk.Liu@amd.com are

queue-4.14/drm-amdgpu-fix-random-missing-of-flr-notify.patch
queue-4.14/drm-amdgpu-fix-virtual-dce-bug.patch