linux-kernel - [PATCH 4.14 1/2] usb: gadget: don't release an existing dev->buf

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Date:   Tue,  1 Mar 2022 10:26:07 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     stable@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, ben@...adent.org.uk,
        balbi@...nel.org, axboe@...nel.dk, mingo@...nel.org,
        jj251510319013@...il.com, zsm@...omium.org,
        stern@...land.harvard.edu, Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH 4.14 1/2] usb: gadget: don't release an existing dev->buf

dev->buf does not need to be released if it already exists before
executing dev_config.

Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Hangyu Hua <hbh25y@...il.com>
Link: https://lore.kernel.org/r/20211231172138.7993-2-hbh25y@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: stable@...r.kernel.org #4.4+
---
 drivers/usb/gadget/legacy/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 3b58f4fc0a80..eaad03c0252f 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1826,8 +1826,9 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	spin_lock_irq (&dev->lock);
 	value = -EINVAL;
 	if (dev->buf) {
+		spin_unlock_irq(&dev->lock);
 		kfree(kbuf);
-		goto fail;
+		return value;
 	}
 	dev->buf = kbuf;
 
-- 
2.25.1