From abb0f6a79fe8eba7982b73313b8623259d78c3f6 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 2 Jan 2016 14:59:38 -0500
Subject: cdrom: don't open-code memdup_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index c206ccd..1b257ea 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -3186,15 +3186,11 @@ static noinline int mmc_ioctl_dvd_read_struct(struct cdrom_device_info *cdi,
 	if (!CDROM_CAN(CDC_DVD))
 		return -ENOSYS;
 
-	s = kmalloc(size, GFP_KERNEL);
-	if (!s)
-		return -ENOMEM;
+	s = memdup_user(arg, size);
+	if (IS_ERR(s))
+		return PTR_ERR(s);
 
 	cd_dbg(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
-	if (copy_from_user(s, arg, size)) {
-		kfree(s);
-		return -EFAULT;
-	}
 
 	ret = dvd_read_struct(cdi, s, cgc);
 	if (ret)
-- 
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