In ravb_probe, priv->work was bound with ravb_tx_timeout_work.
If timeout occurs, it will start the work. And if we call
ravb_remove without finishing the work, there may be a
use-after-free bug on ndev.
Fix it by finishing the job before cleanup in ravb_remove.
Note that this bug is found by static analysis, it might be
false positive.
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
Reviewed-by: Sergey Shtylyov <s.shtylyov@xxxxxx>
---
v4:
- add information about the bug was found suggested by Yunsheng Lin
v3:
- fix typo in commit message
v2:
- stop dev_watchdog so that handle no more timeout work suggested by Yunsheng Lin,
add an empty line to make code clear suggested by Sergey Shtylyov
---
drivers/net/ethernet/renesas/ravb_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 4d6b3b7d6abb..ce2da5101e51 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2885,6 +2885,9 @@ static int ravb_remove(struct platform_device *pdev)
struct ravb_private *priv = netdev_priv(ndev);
const struct ravb_hw_info *info = priv->info;
+ netif_carrier_off(ndev);
+ netif_tx_disable(ndev);
+ cancel_work_sync(&priv->work);
/* Stop PTP Clock driver */
if (info->ccc_gac)
ravb_ptp_stop(ndev);
--
2.25.1
