It appears that there is a typo in the code where the nlattr array is
being parsed with policy br_cfm_cc_ccm_tx_policy, but the instance is
being accessed via IFLA_BRIDGE_CFM_CC_RDI_INSTANCE, which is associated
with the policy br_cfm_cc_rdi_policy.

This problem was introduced by commit 2be665c3940d ("bridge: cfm: Netlink
SET configuration Interface.").

Though it seems like a harmless typo since these two enum owns the exact
same value (1 here), it is quite misleading hence fix it by using the
correct enum IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE here.

Signed-off-by: Lin Ma <linma@zju.edu.cn>
Reviewed-by: Simon Horman <horms@kernel.org>
---
V1 -> V2: remove Fixes tag as this patch resolves nothing but a typo.

 net/bridge/br_cfm_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
index 5c4c369f8536..2faab44652e7 100644
--- a/net/bridge/br_cfm_netlink.c
+++ b/net/bridge/br_cfm_netlink.c
@@ -362,7 +362,7 @@ static int br_cc_ccm_tx_parse(struct net_bridge *br, struct nlattr *attr,
 
 	memset(&tx_info, 0, sizeof(tx_info));
 
-	instance = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]);
+	instance = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE]);
 	nla_memcpy(&tx_info.dmac.addr,
 		   tb[IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC],
 		   sizeof(tx_info.dmac.addr));
-- 
2.17.1

On 20/12/2023 18:34, Lin Ma wrote:
> It appears that there is a typo in the code where the nlattr array is
> being parsed with policy br_cfm_cc_ccm_tx_policy, but the instance is
> being accessed via IFLA_BRIDGE_CFM_CC_RDI_INSTANCE, which is associated
> with the policy br_cfm_cc_rdi_policy.
> 
> This problem was introduced by commit 2be665c3940d ("bridge: cfm: Netlink
> SET configuration Interface.").
> 
> Though it seems like a harmless typo since these two enum owns the exact
> same value (1 here), it is quite misleading hence fix it by using the
> correct enum IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE here.
> 
> Signed-off-by: Lin Ma <linma@zju.edu.cn>
> Reviewed-by: Simon Horman <horms@kernel.org>
> ---
> V1 -> V2: remove Fixes tag as this patch resolves nothing but a typo.
> 
>  net/bridge/br_cfm_netlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bridge/br_cfm_netlink.c b/net/bridge/br_cfm_netlink.c
> index 5c4c369f8536..2faab44652e7 100644
> --- a/net/bridge/br_cfm_netlink.c
> +++ b/net/bridge/br_cfm_netlink.c
> @@ -362,7 +362,7 @@ static int br_cc_ccm_tx_parse(struct net_bridge *br, struct nlattr *attr,
>  
>  	memset(&tx_info, 0, sizeof(tx_info));
>  
> -	instance = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_RDI_INSTANCE]);
> +	instance = nla_get_u32(tb[IFLA_BRIDGE_CFM_CC_CCM_TX_INSTANCE]);
>  	nla_memcpy(&tx_info.dmac.addr,
>  		   tb[IFLA_BRIDGE_CFM_CC_CCM_TX_DMAC],
>  		   sizeof(tx_info.dmac.addr));

Acked-by: Nikolay Aleksandrov <razor@blackwall.org>