linux-kernel - [PATCH 4.9 3/7] r8152: Fix potential PM refcount imbalance

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Message-Id: <20210806081109.431771827@linuxfoundation.org>
Date:   Fri,  6 Aug 2021 10:14:42 +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, Takashi Iwai <tiwai@...e.de>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 3/7] r8152: Fix potential PM refcount imbalance

From: Takashi Iwai <tiwai@...e.de>

[ Upstream commit 9c23aa51477a37f8b56c3c40192248db0663c196 ]

rtl8152_close() takes the refcount via usb_autopm_get_interface() but
it doesn't release when RTL8152_UNPLUG test hits.  This may lead to
the imbalance of PM refcount.  This patch addresses it.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1186194
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/usb/r8152.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 64fdea332886..96f6edcb0062 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -3347,9 +3347,10 @@ static int rtl8152_close(struct net_device *netdev)
 		tp->rtl_ops.down(tp);
 
 		mutex_unlock(&tp->control);
+	}
 
+	if (!res)
 		usb_autopm_put_interface(tp->intf);
-	}
 
 	free_all_mem(tp);
 
-- 
2.30.2