linux-kernel - [PATCH] xhci: dbc: Fix memory leak in xhci_alloc

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Date:   Tue, 13 Sep 2022 23:36:09 -0300
From:   Rafael Mendonca <rafaelmendsr@...il.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] xhci: dbc: Fix memory leak in xhci_alloc_dbc()

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()")
Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
---
 drivers/usb/host/xhci-dbgcap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index e61155fa6379..f1367b53b260 100644
--- 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 __iomem *base, const struct dbc_driver *
 	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);
-- 
2.34.1