linux-kernel - [PATCH] USB: gadget: f_fs: fix memdup

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Date:   Mon, 8 Mar 2021 15:09:51 +0800
From:   kernel test robot <lkp@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Peter Chen <peter.chen@....com>,
        Felipe Balbi <balbi@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Vamsi Krishna Samavedam <vskrishn@...eaurora.org>,
        Sriharsha Allenki <sallenki@...eaurora.org>
Subject: [PATCH] USB: gadget: f_fs: fix memdup_user.cocci warnings

From: kernel test robot <lkp@...el.com>

drivers/usb/gadget/function/f_fs.c:3829:8-15: WARNING opportunity for memdup_user

 Use memdup_user rather than duplicating its implementation
 This is a little bit restricted to reduce false positives

Generated by: scripts/coccinelle/api/memdup_user.cocci

Fixes: 8704fd73bf56 ("USB: gadget: f_fs: remove likely/unlikely")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: kernel test robot <lkp@...el.com>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   144c79ef33536b4ecb4951e07dbc1f2b7fa99d32
commit: 8704fd73bf5658bf4b827643f7f526481082d83f USB: gadget: f_fs: remove likely/unlikely

 f_fs.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3826,14 +3826,9 @@ static char *ffs_prepare_buffer(const ch
 	if (!len)
 		return NULL;
 
-	data = kmalloc(len, GFP_KERNEL);
-	if (!data)
-		return ERR_PTR(-ENOMEM);
-
-	if (copy_from_user(data, buf, len)) {
-		kfree(data);
-		return ERR_PTR(-EFAULT);
-	}
+	data = memdup_user(buf, len);
+	if (IS_ERR(data))
+		return ERR_PTR(PTR_ERR(data));
 
 	pr_vdebug("Buffer from user space:\n");
 	ffs_dump_mem("", data, len);