From 5dca8eff4627315df98feec09fff9dfe3356325e Mon Sep 17 00:00:00 2001 From: Volodymyr Mytnyk Date: Thu, 18 Nov 2021 21:51:40 +0200 Subject: [PATCH] net: marvell: prestera: fix double free issue on err path [ Upstream commit e8d032507cb7912baf1d3e0af54516f823befefd ] fix error path handling in prestera_bridge_port_join() that cases prestera driver to crash (see below). Trace: Internal error: Oops: 96000044 [#1] SMP Modules linked in: prestera_pci prestera uio_pdrv_genirq CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : prestera_bridge_destroy+0x2c/0xb0 [prestera] lr : prestera_bridge_port_join+0x2cc/0x350 [prestera] sp : ffff800011a1b0f0 ... x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122 Call trace: prestera_bridge_destroy+0x2c/0xb0 [prestera] prestera_bridge_port_join+0x2cc/0x350 [prestera] prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera] prestera_netdev_event_handler+0xf4/0x110 [prestera] raw_notifier_call_chain+0x54/0x80 call_netdevice_notifiers_info+0x54/0xa0 __netdev_upper_dev_link+0x19c/0x380 Fixes: e1189d9a5fbe ("net: marvell: prestera: Add Switchdev driver implementation") Signed-off-by: Volodymyr Mytnyk Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/marvell/prestera/prestera_switchdev.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c index 7d83e1f91ef1..9101d00e96b9 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_switchdev.c @@ -439,8 +439,8 @@ static int prestera_port_bridge_join(struct prestera_port *port, br_port = prestera_bridge_port_add(bridge, port->dev); if (IS_ERR(br_port)) { - err = PTR_ERR(br_port); - goto err_brport_create; + prestera_bridge_put(bridge); + return PTR_ERR(br_port); } if (bridge->vlan_enabled) @@ -454,8 +454,6 @@ static int prestera_port_bridge_join(struct prestera_port *port, err_port_join: prestera_bridge_port_put(br_port); -err_brport_create: - prestera_bridge_put(bridge); return err; } -- 2.34.1