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| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2021-06-18 19:36:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 16:17:29 +0200 |
| commit | 2c9e095989b4779767bca0a532f168e80ed09ec7 (patch) | |
| tree | f306c56bfe466353b54f83ec71f1f03fbff0a01c /net | |
| parent | 630f13442f1472abe5013ef98f76a3bbca64dd80 (diff) | |
| download | linux-stable-2c9e095989b4779767bca0a532f168e80ed09ec7.tar.gz linux-stable-2c9e095989b4779767bca0a532f168e80ed09ec7.tar.bz2 linux-stable-2c9e095989b4779767bca0a532f168e80ed09ec7.zip | |
can: gw: synchronize rcu operations before removing gw job entry
commit fb8696ab14adadb2e3f6c17c18ed26b3ecd96691 upstream.
can_can_gw_rcv() is called under RCU protection, so after calling
can_rx_unregister(), we have to call synchronize_rcu in order to wait
for any RCU read-side critical sections to finish before removing the
kmem_cache entry with the referenced gw job entry.
Link: https://lore.kernel.org/r/20210618173645.2238-1-socketcan@hartkopp.net
Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/can/gw.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/can/gw.c b/net/can/gw.c index 5114b8f07fd4..4db0b1819890 100644 --- a/net/can/gw.c +++ b/net/can/gw.c @@ -494,6 +494,7 @@ static int cgw_notifier(struct notifier_block *nb, if (gwj->src.dev == dev || gwj->dst.dev == dev) { hlist_del(&gwj->list); cgw_unregister_filter(net, gwj); + synchronize_rcu(); kmem_cache_free(cgw_cache, gwj); } } @@ -941,6 +942,7 @@ static void cgw_remove_all_jobs(struct net *net) hlist_for_each_entry_safe(gwj, nx, &net->can.cgw_list, list) { hlist_del(&gwj->list); cgw_unregister_filter(net, gwj); + synchronize_rcu(); kmem_cache_free(cgw_cache, gwj); } } @@ -1010,6 +1012,7 @@ static int cgw_remove_job(struct sk_buff *skb, struct nlmsghdr *nlh, hlist_del(&gwj->list); cgw_unregister_filter(net, gwj); + synchronize_rcu(); kmem_cache_free(cgw_cache, gwj); err = 0; break; |