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SubjectRe: [PATCH] flow_offload: action should not be NULL when it is referenced
On Sat, Jun 26, 2021 at 04:56:06AM -0700, 13145886936@163.com wrote:
> From: gushengxian <gushengxian@yulong.com>
>
> "action" should not be NULL when it is referenced.
>
> Signed-off-by: gushengxian <13145886936@163.com>
> Signed-off-by: gushengxian <gushengxian@yulong.com>
> ---
> include/net/flow_offload.h | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> index dc5c1e69cd9f..69c9eabf8325 100644
> --- a/include/net/flow_offload.h
> +++ b/include/net/flow_offload.h
> @@ -319,12 +319,14 @@ flow_action_mixed_hw_stats_check(const struct flow_action *action,
> if (flow_offload_has_one_action(action))
> return true;
>
> - flow_action_for_each(i, action_entry, action) {
> - if (i && action_entry->hw_stats != last_hw_stats) {
> - NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
> - return false;
> + if (action) {

This patch generates a smatch warning:

include/net/flow_offload.h:322 flow_action_mixed_hw_stats_check() warn: variable dereferenced before check 'action' (see line 319)

Why the patch is needed? 'action' is already dereferenced in
flow_offload_has_one_action()

> + flow_action_for_each(i, action_entry, action) {
> + if (i && action_entry->hw_stats != last_hw_stats) {
> + NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
> + return false;
> + }
> + last_hw_stats = action_entry->hw_stats;
> }
> - last_hw_stats = action_entry->hw_stats;
> }
> return true;
> }
> --
> 2.25.1
>
>

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