linux-kernel - [PATCH 4.4 013/132] USB: dummy-hcd: Fix uninitialized array use in init()

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Message-Id: <20201228124847.039350869@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:48:17 +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>,
        Bui Quang Minh <minhquangbui99@...il.com>
Subject: [PATCH 4.4 013/132] USB: dummy-hcd: Fix uninitialized array use in init()

From: Bui Quang Minh <minhquangbui99@...il.com>

commit e90cfa813da7a527785033a0b247594c2de93dd8 upstream.

This error path

	err_add_pdata:
		for (i = 0; i < mod_data.num; i++)
			kfree(dum[i]);

can be triggered when not all dum's elements are initialized.

Fix this by initializing all dum's elements to NULL.

Acked-by: Alan Stern <stern@...land.harvard.edu>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Bui Quang Minh <minhquangbui99@...il.com>
Link: https://lore.kernel.org/r/1607063090-3426-1-git-send-email-minhquangbui99@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/udc/dummy_hcd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -2741,7 +2741,7 @@ static int __init init(void)
 {
 	int	retval = -ENOMEM;
 	int	i;
-	struct	dummy *dum[MAX_NUM_UDC];
+	struct	dummy *dum[MAX_NUM_UDC] = {};
 
 	if (usb_disabled())
 		return -ENODEV;