linux-kernel - [PATCH 6.0 029/862] xhci: dbc: Fix memory leak in xhci_alloc

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Date:   Wed, 19 Oct 2022 10:21:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rafael Mendonca <rafaelmendsr@...il.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 6.0 029/862] xhci: dbc: Fix memory leak in xhci_alloc_dbc()

From: Rafael Mendonca <rafaelmendsr@...il.com>

commit d591b32e519603524a35b172156db71df9116902 upstream.

If DbC is already in use, then the allocated memory for the xhci_dbc struct
doesn't get freed before returning NULL, which leads to a memleak.

Fixes: 534675942e90 ("xhci: dbc: refactor xhci_dbc_init()")
Cc: stable@...r.kernel.org
Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Link: https://lore.kernel.org/r/20220921123450.671459-3-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/host/xhci-dbgcap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -988,7 +988,7 @@ xhci_alloc_dbc(struct device *dev, void
 	dbc->driver = driver;
 
 	if (readl(&dbc->regs->control) & DBC_CTRL_DBC_ENABLE)
-		return NULL;
+		goto err;
 
 	INIT_DELAYED_WORK(&dbc->event_work, xhci_dbc_handle_events);
 	spin_lock_init(&dbc->lock);