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charset="utf-8" When IPV6_MROUTE_MULTIPLE_TABLES is enabled, multicast routing tables must be read under RCU or RTNL lock. In case ip6mr_mfc_seq_start() fails with an error (currently not possible, as RT6_TABLE_DFLT always exists, ip6mr_get_table() cannot fail in this case), ip6mr_mfc_seq_stop() would be called and release the RCU lock. Fixes: d1db275dd3f6 ("ipv6: ip6mr: support multiple tables") Signed-off-by: Stefan Wiehler --- net/ipv6/ip6mr.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c index 9bf42aafc7f0..90d0f09cdd4e 100644 --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -464,10 +464,12 @@ static const struct seq_operations ip6mr_vif_seq_ops = =3D { }; =20 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) { struct net *net =3D seq_file_net(seq); struct mr_table *mrt; =20 + rcu_read_lock(); mrt =3D ip6mr_get_table(net, RT6_TABLE_DFLT); if (!mrt) return ERR_PTR(-ENOENT); @@ -475,6 +477,12 @@ static void *ipmr_mfc_seq_start(struct seq_file *seq, = loff_t *pos) return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock); } =20 +static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + rcu_read_unlock(); +} + static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) { int n; @@ -520,7 +528,7 @@ static int ipmr_mfc_seq_show(struct seq_file *seq, void= *v) static const struct seq_operations ipmr_mfc_seq_ops =3D { .start =3D ipmr_mfc_seq_start, .next =3D mr_mfc_seq_next, - .stop =3D mr_mfc_seq_stop, + .stop =3D ipmr_mfc_seq_stop, .show =3D ipmr_mfc_seq_show, }; #endif --=20 2.42.0