Re: [PATCH] net/mlx5: fix possible stack overflows

[Arnd Bergmann]

On Thu, Feb 15, 2024, at 01:18, Zhu Yanjun wrote:
> 在 2024/2/13 18:08, Arnd Bergmann 写道:

>>   static int
>> -dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx,
>> +dr_dump_rule_rx_tx(struct seq_file *file, char *buff,
>> +		   struct mlx5dr_rule_rx_tx *rule_rx_tx,
>>   		   bool is_rx, const u64 rule_id, u8 format_ver)
>>   {
>>   	struct mlx5dr_ste *ste_arr[DR_RULE_MAX_STES + DR_ACTION_MAX_STES];
>> @@ -533,7 +532,7 @@ dr_dump_rule_rx_tx(struct seq_file *file, struct mlx5dr_rule_rx_tx *rule_rx_tx,
>>   		return 0;
>>   
>>   	while (i--) {
>> -		ret = dr_dump_rule_mem(file, ste_arr[i], is_rx, rule_id,
>
> Before buff is reused, I am not sure whether buff should be firstly 
> zeroed or not.

I don't see why it would, but if you want to zero it, that would be
a separate patch that is already needed on the existing code,
which never zeroes its buffers.

    Arnd