linux-kernel - [PATCH -next] drm/imagination: Use memdup

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Message-ID: <20240831102930.97502-1-ruanjinjie@huawei.com>
Date: Sat, 31 Aug 2024 18:29:30 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <frank.binns@...tec.com>, <matt.coster@...tec.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH -next] drm/imagination: Use memdup_user() helper to simplify code

Switching to memdup_user(), which combines kmalloc() and copy_from_user(),
and it can simplfy code.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 drivers/gpu/drm/imagination/pvr_job.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_job.c b/drivers/gpu/drm/imagination/pvr_job.c
index 78c2f3c6dce0..618503a212a7 100644
--- a/drivers/gpu/drm/imagination/pvr_job.c
+++ b/drivers/gpu/drm/imagination/pvr_job.c
@@ -90,20 +90,13 @@ static int pvr_fw_cmd_init(struct pvr_device *pvr_dev, struct pvr_job *job,
 	void *stream;
 	int err;
 
-	stream = kzalloc(stream_len, GFP_KERNEL);
-	if (!stream)
-		return -ENOMEM;
-
-	if (copy_from_user(stream, u64_to_user_ptr(stream_userptr), stream_len)) {
-		err = -EFAULT;
-		goto err_free_stream;
-	}
+	stream = memdup_user(u64_to_user_ptr(stream_userptr), stream_len);
+	if (IS_ERR(stream))
+		return PTR_ERR(stream);
 
 	err = pvr_job_process_stream(pvr_dev, stream_def, stream, stream_len, job);
 
-err_free_stream:
 	kfree(stream);
-
 	return err;
 }
 
-- 
2.34.1