* [PATCH] net: bridge: fix error return code of do_update_counters()
@ 2021-03-09 2:28 Jia-Ju Bai
2021-03-09 11:01 ` Florian Westphal
0 siblings, 1 reply; 3+ messages in thread
From: Jia-Ju Bai @ 2021-03-09 2:28 UTC (permalink / raw)
To: pablo, kadlec, fw, roopa, nikolay, davem, kuba
Cc: netfilter-devel, coreteam, bridge, netdev, linux-kernel,
Jia-Ju Bai
When find_table_lock() returns NULL to t, no error return code of
do_update_counters() is assigned.
To fix this bug, ret is assigned with -ENOENT in this case.
Fixes: 49facff9f925 ("netfilter: ebtables: split update_counters into two functions")
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
net/bridge/netfilter/ebtables.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index ebe33b60efd6..66c9e4077985 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1256,8 +1256,10 @@ static int do_update_counters(struct net *net, const char *name,
return -ENOMEM;
t = find_table_lock(net, name, &ret, &ebt_mutex);
- if (!t)
+ if (!t) {
+ ret = -ENOENT;
goto free_tmp;
+ }
if (num_counters != t->private->nentries) {
ret = -EINVAL;
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] net: bridge: fix error return code of do_update_counters()
2021-03-09 2:28 [PATCH] net: bridge: fix error return code of do_update_counters() Jia-Ju Bai
@ 2021-03-09 11:01 ` Florian Westphal
2021-03-09 13:31 ` Jia-Ju Bai
0 siblings, 1 reply; 3+ messages in thread
From: Florian Westphal @ 2021-03-09 11:01 UTC (permalink / raw)
To: Jia-Ju Bai
Cc: pablo, kadlec, fw, roopa, nikolay, davem, kuba, netfilter-devel,
coreteam, bridge, netdev, linux-kernel
Jia-Ju Bai <baijiaju1990@gmail.com> wrote:
> When find_table_lock() returns NULL to t, no error return code of
> do_update_counters() is assigned.
Its -ENOENT.
> t = find_table_lock(net, name, &ret, &ebt_mutex);
^^^^^
ret is passed to find_table_lock, which passes it to
find_inlist_lock_noload() which will set *ret = -ENOENT
for NULL case.
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] net: bridge: fix error return code of do_update_counters()
2021-03-09 11:01 ` Florian Westphal
@ 2021-03-09 13:31 ` Jia-Ju Bai
0 siblings, 0 replies; 3+ messages in thread
From: Jia-Ju Bai @ 2021-03-09 13:31 UTC (permalink / raw)
To: Florian Westphal
Cc: pablo, kadlec, roopa, nikolay, davem, kuba, netfilter-devel,
coreteam, bridge, netdev, linux-kernel
On 2021/3/9 19:01, Florian Westphal wrote:
> Jia-Ju Bai <baijiaju1990@gmail.com> wrote:
>> When find_table_lock() returns NULL to t, no error return code of
>> do_update_counters() is assigned.
> Its -ENOENT.
>
>> t = find_table_lock(net, name, &ret, &ebt_mutex);
> ^^^^^
>
> ret is passed to find_table_lock, which passes it to
> find_inlist_lock_noload() which will set *ret = -ENOENT
> for NULL case.
Thanks for the reply!
I did not notice "&ret" in find_table_lock()...
I am sorry for the false positive.
Best wishes,
Jia-Ju Bai
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-09 2:28 [PATCH] net: bridge: fix error return code of do_update_counters() Jia-Ju Bai
2021-03-09 11:01 ` Florian Westphal
2021-03-09 13:31 ` Jia-Ju Bai
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