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From:   Wang Yufen <wangyufen@huawei.com>
To:     <ajay.kathat@microchip.com>, <claudiu.beznea@microchip.com>,
        <kvalo@kernel.org>, <davem@davemloft.net>, <edumazet@google.com>,
        <kuba@kernel.org>, <pabeni@redhat.com>
CC:     <davidm@egauge.net>, <wangyufen@huawei.com>,
        <linux-wireless@vger.kernel.org>, <netdev@vger.kernel.org>
Subject: [PATCH wireless] wilc1000: add missing unregister_netdev() in wilc_netdev_ifc_init()
Date:   Thu, 24 Nov 2022 19:38:22 +0800
Message-ID: <1669289902-23639-1-git-send-email-wangyufen@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Fault injection test reports this issue:

kernel BUG at net/core/dev.c:10731!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
Call Trace:
  <TASK>
  wilc_netdev_ifc_init+0x19f/0x220 [wilc1000 884bf126e9e98af6a708f266a8dffd53f99e4bf5]
  wilc_cfg80211_init+0x30c/0x380 [wilc1000 884bf126e9e98af6a708f266a8dffd53f99e4bf5]
  wilc_bus_probe+0xad/0x2b0 [wilc1000_spi 1520a7539b6589cc6cde2ae826a523a33f8bacff]
  spi_probe+0xe4/0x140
  really_probe+0x17e/0x3f0
  __driver_probe_device+0xe3/0x170
  driver_probe_device+0x49/0x120

The root case here is alloc_ordered_workqueue() fails, but
cfg80211_unregister_netdevice() or unregister_netdev() not be called in
error handling path. To fix add unregister_netdev goto lable to add the
unregister operation in error handling path.

Fixes: 09ed8bfc5215 ("wilc1000: Rename workqueue from "WILC_wq" to "NETDEV-wq"")
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
---
 drivers/net/wireless/microchip/wilc1000/netdev.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.c b/drivers/net/wireless/microchip/wilc1000/netdev.c
index 9b319a4..7b39701 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.c
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.c
@@ -980,7 +980,7 @@ struct wilc_vif *wilc_netdev_ifc_init(struct wilc *wl, const char *name,
 						    ndev->name);
 	if (!wl->hif_workqueue) {
 		ret = -ENOMEM;
-		goto error;
+		goto unregister_netdev;
 	}
 
 	ndev->needs_free_netdev = true;
@@ -995,6 +995,11 @@ struct wilc_vif *wilc_netdev_ifc_init(struct wilc *wl, const char *name,
 
 	return vif;
 
+unregister_netdev:
+	if (rtnl_locked)
+		cfg80211_unregister_netdevice(ndev);
+	else
+		unregister_netdev(ndev);
   error:
 	free_netdev(ndev);
 	return ERR_PTR(ret);
-- 
1.8.3.1