linux-kernel - [PATCH AUTOSEL 5.1 07/70] staging: wilc1000: Fix some double unlock bugs in wilc_wlan

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Message-Id: <20190608113950.8033-7-sashal@kernel.org>
Date:   Sat,  8 Jun 2019 07:38:46 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, devel@...verdev.osuosl.org
Subject: [PATCH AUTOSEL 5.1 07/70] staging: wilc1000: Fix some double unlock bugs in wilc_wlan_cleanup()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit fea69916360468e364a4988db25a5afa835f3406 ]

If ->hif_read_reg() or ->hif_write_reg() fail then the code unlocks
and keeps executing.  It should just return.

Fixes: c5c77ba18ea6 ("staging: wilc1000: Add SDIO/SPI 802.11 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/wilc1000/wilc_wlan.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/wilc1000/wilc_wlan.c b/drivers/staging/wilc1000/wilc_wlan.c
index c2389695fe20..70b1ab21f8a3 100644
--- a/drivers/staging/wilc1000/wilc_wlan.c
+++ b/drivers/staging/wilc1000/wilc_wlan.c
@@ -1076,13 +1076,17 @@ void wilc_wlan_cleanup(struct net_device *dev)
 	acquire_bus(wilc, WILC_BUS_ACQUIRE_AND_WAKEUP);
 
 	ret = wilc->hif_func->hif_read_reg(wilc, WILC_GP_REG_0, &reg);
-	if (!ret)
+	if (!ret) {
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
+		return;
+	}
 
 	ret = wilc->hif_func->hif_write_reg(wilc, WILC_GP_REG_0,
 					(reg | ABORT_INT));
-	if (!ret)
+	if (!ret) {
 		release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
+		return;
+	}
 
 	release_bus(wilc, WILC_BUS_RELEASE_ALLOW_SLEEP);
 	wilc->hif_func->hif_deinit(NULL);
-- 
2.20.1