linux-kernel - [PATCH] drm/amdkfd: Switch over to memdup

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Date:   Wed, 14 Jun 2023 10:04:32 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     Felix.Kuehling@....com
Cc:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: [PATCH] drm/amdkfd: Switch over to memdup_user()

Use memdup_user() rather than duplicating its implementation. This is a
little bit restricted to reduce false positives.

./drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c:2813:13-20: WARNING opportunity for memdup_user.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5523
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

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 d6b15493fffd..637962d4083c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -2810,12 +2810,9 @@ static uint32_t *get_queue_ids(uint32_t num_queues, uint32_t *usr_queue_id_array
 	if (!usr_queue_id_array)
 		return NULL;
 
-	queue_ids = kzalloc(array_size, GFP_KERNEL);
-	if (!queue_ids)
-		return ERR_PTR(-ENOMEM);
-
-	if (copy_from_user(queue_ids, usr_queue_id_array, array_size))
-		return ERR_PTR(-EFAULT);
+	queue_ids = memdup_user(usr_queue_id_array, array_size);
+	if (IS_ERR(queue_ids))
+		return PTR_ERR(queue_ids);
 
 	return queue_ids;
 }
-- 
2.20.1.7.g153144c