old_meter needs to be free after it is detached regardless of whether
the new meter is successfully attached.

Fixes: c7c4c44c9a95 ("net: openvswitch: expand the meters supported number")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
---

v2: use goto label and free old_meter outside of ovs lock.

v3: add the label and keep the lock in place.

 net/openvswitch/meter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
index 6e38f68f88c2..f2698d2316df 100644
--- a/net/openvswitch/meter.c
+++ b/net/openvswitch/meter.c
@@ -449,7 +449,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
 
 	err = attach_meter(meter_tbl, meter);
 	if (err)
-		goto exit_unlock;
+		goto exit_free_old_meter;
 
 	ovs_unlock();
 
@@ -472,6 +472,8 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
 	genlmsg_end(reply, ovs_reply_header);
 	return genlmsg_reply(reply, info);
 
+exit_free_old_meter:
+	ovs_meter_free(old_meter);
 exit_unlock:
 	ovs_unlock();
 	nlmsg_free(reply);
-- 
2.34.1

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 10 Feb 2023 10:05:51 +0800 you wrote:
> old_meter needs to be free after it is detached regardless of whether
> the new meter is successfully attached.
> 
> Fixes: c7c4c44c9a95 ("net: openvswitch: expand the meters supported number")
> Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
> ---
> 
> [...]

Here is the summary with links:
  - [v3] net: openvswitch: fix possible memory leak in ovs_meter_cmd_set()
    https://git.kernel.org/netdev/net/c/2fa28f5c6fcb

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On 10 Feb 2023, at 3:05, Hangyu Hua wrote:

> old_meter needs to be free after it is detached regardless of whether
> the new meter is successfully attached.
>
> Fixes: c7c4c44c9a95 ("net: openvswitch: expand the meters supported number")
> Signed-off-by: Hangyu Hua <hbh25y@gmail.com>

Thanks for doing a v3. The change looks good to me!

Acked-by: Eelco Chaudron <echaudro@redhat.com>

> ---
>
> v2: use goto label and free old_meter outside of ovs lock.
>
> v3: add the label and keep the lock in place.
>
>  net/openvswitch/meter.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/meter.c b/net/openvswitch/meter.c
> index 6e38f68f88c2..f2698d2316df 100644
> --- a/net/openvswitch/meter.c
> +++ b/net/openvswitch/meter.c
> @@ -449,7 +449,7 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
>
>  	err = attach_meter(meter_tbl, meter);
>  	if (err)
> -		goto exit_unlock;
> +		goto exit_free_old_meter;
>  	ovs_unlock();
>
> @@ -472,6 +472,8 @@ static int ovs_meter_cmd_set(struct sk_buff *skb, struct genl_info *info)
>  	genlmsg_end(reply, ovs_reply_header);
>  	return genlmsg_reply(reply, info);
>
> +exit_free_old_meter:
> +	ovs_meter_free(old_meter);
>  exit_unlock:
>  	ovs_unlock();
>  	nlmsg_free(reply);
> -- 
> 2.34.1

On Fri, Feb 10, 2023 at 08:35:50AM +0100, Eelco Chaudron wrote:
> 
> 
> On 10 Feb 2023, at 3:05, Hangyu Hua wrote:
> 
> > old_meter needs to be free after it is detached regardless of whether
> > the new meter is successfully attached.
> >
> > Fixes: c7c4c44c9a95 ("net: openvswitch: expand the meters supported number")
> > Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
> 
> Thanks for doing a v3. The change looks good to me!
> 
> Acked-by: Eelco Chaudron <echaudro@redhat.com>

Reviewed-by: Simon Horman <simon.horman@corigine.com>