diff options
| author | Jozsef Kadlecsik <kadlec@mail.kfki.hu> | 2021-01-29 22:57:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-23 16:00:32 +0300 |
| commit | c7559fe4df16c31d1126ba74e6c79bd6f4917f20 (patch) | |
| tree | cabb8a84be1da0ed17041be50f93647ce2823761 /net | |
| parent | 766107351731ae223ebf60ca22bdfeb47ce6acc8 (diff) | |
| download | linux-c7559fe4df16c31d1126ba74e6c79bd6f4917f20.tar.xz | |
netfilter: xt_recent: Fix attempt to update deleted entry
[ Upstream commit b1bdde33b72366da20d10770ab7a49fe87b5e190 ]
When both --reap and --update flag are specified, there's a code
path at which the entry to be updated is reaped beforehand,
which then leads to kernel crash. Reap only entries which won't be
updated.
Fixes kernel bugzilla #207773.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=207773
Reported-by: Reindl Harald <h.reindl@thelounge.net>
Fixes: 0079c5aee348 ("netfilter: xt_recent: add an entry reaper")
Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/xt_recent.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index cf96d230e5a3..cafbddf844d6 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -155,7 +155,8 @@ static void recent_entry_remove(struct recent_table *t, struct recent_entry *e) /* * Drop entries with timestamps older then 'time'. */ -static void recent_entry_reap(struct recent_table *t, unsigned long time) +static void recent_entry_reap(struct recent_table *t, unsigned long time, + struct recent_entry *working, bool update) { struct recent_entry *e; @@ -165,6 +166,12 @@ static void recent_entry_reap(struct recent_table *t, unsigned long time) e = list_entry(t->lru_list.next, struct recent_entry, lru_list); /* + * Do not reap the entry which are going to be updated. + */ + if (e == working && update) + return; + + /* * The last time stamp is the most recent. */ if (time_after(time, e->stamps[e->index-1])) @@ -306,7 +313,8 @@ recent_mt(const struct sk_buff *skb, struct xt_action_param *par) /* info->seconds must be non-zero */ if (info->check_set & XT_RECENT_REAP) - recent_entry_reap(t, time); + recent_entry_reap(t, time, e, + info->check_set & XT_RECENT_UPDATE && ret); } if (info->check_set & XT_RECENT_SET || |