linux-kernel - [PATCH] drm/amdkfd: dqm fence memory corruption

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Date:   Wed, 27 Jan 2021 20:33:26 +0800
From:   Qu Huang <jinsdb@....com>
To:     Felix.Kuehling@....com
Cc:     alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Qu Huang <jinsdb@....com>
Subject: [PATCH] drm/amdkfd: dqm fence memory corruption

Amdgpu driver uses 4-byte data type as DQM fence memory,
and transmits GPU address of fence memory to microcode
through query status PM4 message. However, query status
PM4 message definition and microcode processing are all
processed according to 8 bytes. Fence memory only allocates
4 bytes of memory, but microcode does write 8 bytes of memory,
so there is a memory corruption.

Signed-off-by: Qu Huang <jinsdb@....com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index e686ce2..8b38d0c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -1161,7 +1161,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
 	pr_debug("Allocating fence memory\n");
 
 	/* allocate fence memory on the gart */
-	retval = kfd_gtt_sa_allocate(dqm->dev, sizeof(*dqm->fence_addr),
+	retval = kfd_gtt_sa_allocate(dqm->dev, sizeof(uint64_t),
 					&dqm->fence_mem);
 
 	if (retval)
-- 
1.8.3.1