mlxsw: spectrum: Fix memory leak in mlxsw_sp_flower_stats()

The function mlxsw_sp_flower_stats() calls mlxsw_sp_acl_ruleset_get() to
obtain a ruleset reference. If the subsequent call to
mlxsw_sp_acl_rule_lookup() fails to find a rule, the function returns
an error without releasing the ruleset reference, causing a memory leak.

Fix this by using a goto to the existing error handling label, which
calls mlxsw_sp_acl_ruleset_put() to properly release the reference.

Fixes: 7c1b8eb175b69 ("mlxsw: spectrum: Add support for TC flower offload statistics")
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20251112052114.1591695-1-zilin@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index 6a4a81c63451c6d8a70b8eb67253e664e5fd2184..353fd9ca89a68a1d4c600ae2b933c7241a5a8460 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -830,8 +830,10 @@ int mlxsw_sp_flower_stats(struct mlxsw_sp *mlxsw_sp,
                return -EINVAL;
 
        rule = mlxsw_sp_acl_rule_lookup(mlxsw_sp, ruleset, f->cookie);
-       if (!rule)
-               return -EINVAL;
+       if (!rule) {
+               err = -EINVAL;
+               goto err_rule_get_stats;
+       }
 
        err = mlxsw_sp_acl_rule_get_stats(mlxsw_sp, rule, &packets, &bytes,
                                          &drops, &lastuse, &used_hw_stats);