linux-kernel - [PATCH 2/3] net: marvell: prestera: fix memory use after free

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Date: Mon, 11 Mar 2024 15:51:11 +0200
From: Elad Nachman <enachman@...vell.com>
To: <taras.chornyi@...ision.eu>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <andrew@...n.ch>,
        <kory.maincent@...tlin.com>, <thomas.petazzoni@...tlin.com>,
        <miquel.raynal@...tlin.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <enachman@...vell.com>
Subject: [PATCH 2/3] net: marvell: prestera: fix memory use after free

From: Elad Nachman <enachman@...vell.com>

Prestera driver routing module cleanup process would
release memory and then reference it again, and eventually
free it again.
Remove the redundant first memory free call.
All such double free calls were detected using KASAN.

Signed-off-by: Elad Nachman <enachman@...vell.com>
---
 drivers/net/ethernet/marvell/prestera/prestera_router.c    | 1 -
 drivers/net/ethernet/marvell/prestera/prestera_router_hw.c | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
index de317179a7dc..2da04a17efad 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
@@ -1638,7 +1638,6 @@ void prestera_router_fini(struct prestera_switch *sw)
 	prestera_k_arb_abort(sw);
 
 	kfree(sw->router->nhgrp_hw_state_cache);
-	rhashtable_destroy(&sw->router->kern_fib_cache_ht);
 	prestera_router_hw_fini(sw);
 	kfree(sw->router);
 	sw->router = NULL;
diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
index 02faaea2aefa..254107f664b4 100644
--- a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
+++ b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
@@ -102,7 +102,6 @@ void prestera_router_hw_fini(struct prestera_switch *sw)
 				    prestera_fib_node_destroy_ht_cb, sw);
 	WARN_ON(!list_empty(&sw->router->vr_list));
 	WARN_ON(!list_empty(&sw->router->rif_entry_list));
-	rhashtable_destroy(&sw->router->fib_ht);
 	rhashtable_destroy(&sw->router->nexthop_group_ht);
 	rhashtable_destroy(&sw->router->nh_neigh_ht);
 }
-- 
2.25.1