linux-kernel - [PATCH] floppy: use memdup

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Date:   Sat, 29 Apr 2017 09:45:12 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Jiri Kosina <jikos@...nel.org>, Jens Axboe <axboe@...com>,
        Mike Christie <mchristi@...hat.com>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] floppy: use memdup_user

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 drivers/block/floppy.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 60d4c76..167426c 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3121,16 +3121,13 @@ static int raw_cmd_copyin(int cmd, void __user *param,
 	*rcmd = NULL;
 
 loop:
-	ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
-	if (!ptr)
-		return -ENOMEM;
+	ptr = memdup_user(param, sizeof(*ptr));
+	if (IS_ERR(ptr))
+		return PTR_ERR(ptr);
 	*rcmd = ptr;
-	ret = copy_from_user(ptr, param, sizeof(*ptr));
 	ptr->next = NULL;
 	ptr->buffer_length = 0;
 	ptr->kernel_data = NULL;
-	if (ret)
-		return -EFAULT;
 	param += sizeof(struct floppy_raw_cmd);
 	if (ptr->cmd_count > 33)
 			/* the command may now also take up the space
-- 
2.9.3