linux-kernel - [PATCH 2/3] usb: gadget: f_hid: fix refcount leak on error path

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Date:   Tue, 22 Nov 2022 12:35:22 +0000
From:   John Keeping <john@...anate.com>
To:     linux-usb@...r.kernel.org
Cc:     Fabien Chouteau <fabien.chouteau@...co.com>,
        Peter Korsgaard <peter.korsgaard@...co.com>,
        Felipe Balbi <balbi@...com>,
        Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John Keeping <john@...anate.com>, Lee Jones <lee@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 2/3] usb: gadget: f_hid: fix refcount leak on error path

When failing to allocate report_desc, opts->refcnt has already been
incremented so it needs to be decremented to avoid leaving the options
structure permanently locked.

Fixes: 21a9476a7ba8 ("usb: gadget: hid: add configfs support")
Signed-off-by: John Keeping <john@...anate.com>
---
 drivers/usb/gadget/function/f_hid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index 8b8bbeaa27cb..6be6009f911e 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -1292,6 +1292,7 @@ static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
 						 GFP_KERNEL);
 		if (!hidg->report_desc) {
 			put_device(&hidg->dev);
+			--opts->refcnt;
 			mutex_unlock(&opts->lock);
 			return ERR_PTR(-ENOMEM);
 		}
-- 
2.38.1