linux-kernel - [PATCH 15/20] drm_read(): get rid of pointless access

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Message-Id: <20200509234557.1124086-15-viro@ZenIV.linux.org.uk>
Date:   Sun, 10 May 2020 00:45:52 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: [PATCH 15/20] drm_read(): get rid of pointless access_ok()

From: Al Viro <viro@...iv.linux.org.uk>

address is passed only to copy_to_user()

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 drivers/gpu/drm/drm_file.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index eb009d3ab48f..6a1f6c802415 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -569,9 +569,6 @@ ssize_t drm_read(struct file *filp, char __user *buffer,
 	struct drm_device *dev = file_priv->minor->dev;
 	ssize_t ret;
 
-	if (!access_ok(buffer, count))
-		return -EFAULT;
-
 	ret = mutex_lock_interruptible(&file_priv->event_read_lock);
 	if (ret)
 		return ret;
-- 
2.11.0