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

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Message-ID: <20240831103047.99499-1-ruanjinjie@huawei.com>
Date: Sat, 31 Aug 2024 18:30:47 +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

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_context.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_context.c b/drivers/gpu/drm/imagination/pvr_context.c
index eded5e955cc0..e75fd50a4d9f 100644
--- a/drivers/gpu/drm/imagination/pvr_context.c
+++ b/drivers/gpu/drm/imagination/pvr_context.c
@@ -69,27 +69,19 @@ process_static_context_state(struct pvr_device *pvr_dev, const struct pvr_stream
 	void *stream;
 	int err;
 
-	stream = kzalloc(stream_size, GFP_KERNEL);
-	if (!stream)
-		return -ENOMEM;
-
-	if (copy_from_user(stream, u64_to_user_ptr(stream_user_ptr), stream_size)) {
-		err = -EFAULT;
-		goto err_free;
-	}
+	stream = memdup_user(u64_to_user_ptr(stream_user_ptr), stream_size);
+	if (IS_ERR(stream))
+		return PTR_ERR(stream);
 
 	err = pvr_stream_process(pvr_dev, cmd_defs, stream, stream_size, dest);
-	if (err)
-		goto err_free;
+	if (err) {
+		kfree(stream);
+		return err;
+	}
 
 	kfree(stream);
 
 	return 0;
-
-err_free:
-	kfree(stream);
-
-	return err;
 }
 
 static int init_render_fw_objs(struct pvr_context *ctx,
-- 
2.34.1