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cls_bpf: don't decrement net's refcount when offload fails 

When cls_bpf offload was added it seemed like a good idea to
call cls_bpf_delete_prog() instead of extending the error
handling path, since the software state is fully initialized
at that point.  This handling of errors without jumping to
the end of the function is error prone, as proven by later
commit missing that extra call to __cls_bpf_delete_prog().

__cls_bpf_delete_prog() is now expected to be invoked with
a reference on exts->net or the field zeroed out.  The call
on the offload's error patch does not fullfil this requirement,
leading to each error stealing a reference on net namespace.

Create a function undoing what cls_bpf_set_parms() did and
use it from __cls_bpf_delete_prog() and the error path.

Fixes: aae2c35ec8 ("cls_bpf: use tcf_exts_get_net() before call_rcu()")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Jakub Kicinski 2017-11-27 11:11:41 -08:00 committed by David S. Miller
parent 15fe076ede
commit 25415cec50
1 changed files with 13 additions and 10 deletions
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23
net/sched/cls_bpf.c
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@ -258,11 +258,8 @@ static int cls_bpf_init(struct tcf_proto *tp)
return 0;
}
static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
static void cls_bpf_free_parms(struct cls_bpf_prog *prog)
{
tcf_exts_destroy(&prog->exts);
tcf_exts_put_net(&prog->exts);
if (cls_bpf_is_ebpf(prog))
bpf_prog_put(prog->filter);
else
@ -270,6 +267,14 @@ static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
kfree(prog->bpf_name);
kfree(prog->bpf_ops);
}
static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
{
tcf_exts_destroy(&prog->exts);
tcf_exts_put_net(&prog->exts);
cls_bpf_free_parms(prog);
kfree(prog);
}
@ -514,12 +519,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
goto errout_idr;
ret = cls_bpf_offload(tp, prog, oldprog);
if (ret) {
if (!oldprog)
idr_remove_ext(&head->handle_idr, prog->handle);
__cls_bpf_delete_prog(prog);
return ret;
}
if (ret)
goto errout_parms;
if (!tc_in_hw(prog->gen_flags))
prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
@ -537,6 +538,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
*arg = prog;
return 0;
errout_parms:
cls_bpf_free_parms(prog);
errout_idr:
if (!oldprog)
idr_remove_ext(&head->handle_idr, prog->handle);