diff options
| author | Eric Dumazet <edumazet@google.com> | 2022-04-13 10:35:42 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-27 13:50:47 +0200 |
| commit | 8c5ca6492a86e18ff9ae39f742285996c2209ac9 (patch) | |
| tree | 2a356209c5f23eec07c5698e11b4e0edeaf7d65a /net | |
| parent | f883def546541f53145f8d0591881dc5dd5341d4 (diff) | |
net/sched: cls_u32: fix possible leak in u32_init_knode()
[ Upstream commit ec5b0f605b105457f257f2870acad4a5d463984b ]
While investigating a related syzbot report,
I found that whenever call to tcf_exts_init()
from u32_init_knode() is failing, we end up
with an elevated refcount on ht->refcnt
To avoid that, only increase the refcount after
all possible errors have been evaluated.
Fixes: b9a24bb76bf6 ("net_sched: properly handle failure case of tcf_exts_init()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/cls_u32.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 8cfd5460493c..ed8d26e6468c 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -816,10 +816,6 @@ static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp, new->flags = n->flags; RCU_INIT_POINTER(new->ht_down, ht); - /* bump reference count as long as we hold pointer to structure */ - if (ht) - ht->refcnt++; - #ifdef CONFIG_CLS_U32_PERF /* Statistics may be incremented by readers during update * so we must keep them in tact. When the node is later destroyed @@ -841,6 +837,10 @@ static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp, return NULL; } + /* bump reference count as long as we hold pointer to structure */ + if (ht) + ht->refcnt++; + return new; } |