linux-kernel - [PATCH 4.19 53/57] usb: gadget: Fix memleak in gadgetfs_fill

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Date:   Tue,  1 Dec 2020 09:53:58 +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, Hulk Robot <hulkci@...wei.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Zhang Qilong <zhangqilong3@...wei.com>
Subject: [PATCH 4.19 53/57] usb: gadget: Fix memleak in gadgetfs_fill_super

From: Zhang Qilong <zhangqilong3@...wei.com>

commit 87bed3d7d26c974948a3d6e7176f304b2d41272b upstream.

usb_get_gadget_udc_name will alloc memory for CHIP
in "Enomem" branch. we should free it before error
returns to prevent memleak.

Fixes: 175f712119c57 ("usb: gadget: provide interface for legacy gadgets to get UDC name")
Reported-by: Hulk Robot <hulkci@...wei.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Zhang Qilong <zhangqilong3@...wei.com>
Link: https://lore.kernel.org/r/20201117021629.1470544-3-zhangqilong3@huawei.com
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -2039,6 +2039,9 @@ gadgetfs_fill_super (struct super_block
 	return 0;
 
 Enomem:
+	kfree(CHIP);
+	CHIP = NULL;
+
 	return -ENOMEM;
 }