linux-kernel - [PATCH 4.19 12/51] usb: gadget: dont release an existing dev->buf

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Message-Id: <20220307091637.343320282@linuxfoundation.org>
Date:   Mon,  7 Mar 2022 10:18:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alan Stern <stern@...land.harvard.edu>,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH 4.19 12/51] usb: gadget: dont release an existing dev->buf

From: Hangyu Hua <hbh25y@...il.com>

commit 89f3594d0de58e8a57d92d497dea9fee3d4b9cda upstream.

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>
---
 drivers/usb/gadget/legacy/inode.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -1828,8 +1828,9 @@ dev_config (struct file *fd, const char
 	spin_lock_irq (&dev->lock);
 	value = -EINVAL;
 	if (dev->buf) {
+		spin_unlock_irq(&dev->lock);
 		kfree(kbuf);
-		goto fail;
+		return value;
 	}
 	dev->buf = kbuf;