linux-kernel - [PATCH -next] drm/i915: Use memdup

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Message-ID: <20240831102648.92714-1-ruanjinjie@huawei.com>
Date: Sat, 31 Aug 2024 18:26:48 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <jani.nikula@...ux.intel.com>, <joonas.lahtinen@...ux.intel.com>,
	<rodrigo.vivi@...el.com>, <tursulin@...ulin.net>, <airlied@...il.com>,
	<daniel@...ll.ch>, <chentao@...inos.cn>, <ivan.briano@...el.com>,
	<ruanjinjie@...wei.com>, <vinay.belgaumkar@...el.com>,
	<intel-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH -next] drm/i915: 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/i915/gem/i915_gem_context.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index c0543c35cd6a..c1cc41e90502 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -2159,18 +2159,12 @@ static int set_context_image(struct i915_gem_context *ctx,
 		goto out_ce;
 	}
 
-	state = kmalloc(ce->engine->context_size, GFP_KERNEL);
-	if (!state) {
-		ret = -ENOMEM;
+	state = memdup_user(u64_to_user_ptr(user.image), ce->engine->context_size);
+	if (IS_ERR(state)) {
+		ret = PTR_ERR(state);
 		goto out_ce;
 	}
 
-	if (copy_from_user(state, u64_to_user_ptr(user.image),
-			   ce->engine->context_size)) {
-		ret = -EFAULT;
-		goto out_state;
-	}
-
 	shmem_state = shmem_create_from_data(ce->engine->name,
 					     state, ce->engine->context_size);
 	if (IS_ERR(shmem_state)) {
-- 
2.34.1