Re: [PATCH] net/i40e: fix build with MinGW GCC 12

[Thomas Monjalon <thomas@monjalon.net>]

04/10/2022 13:17, Thomas Monjalon:
> When compiling with MinGW GCC 12,
> the rte_flow_item array is seen as read out of bound:
> 
> net/i40e/i40e_hash.c:389:47: error:
> 	array subscript 50 is above array bounds of ‘const uint64_t[50]’
> 	{aka ‘const long long unsigned int[50]’} [-Werror=array-bounds]
> 	389 | item_hdr = pattern_item_header[last_item_type];
> 	    |            ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
> 
> It seems the assert check done above this line has no impact.
> A check is added to make the compiler happy.

We could add those lines as the real issue is the item array:

Fixes: ef4c16fd9148 ("net/i40e: refactor RSS flow")
Cc: stable@dpdk.org

> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> ---
>  drivers/net/i40e/i40e_hash.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/i40e/i40e_hash.c b/drivers/net/i40e/i40e_hash.c
> index 8962e9d97a..ba616aea9f 100644
> --- a/drivers/net/i40e/i40e_hash.c
> +++ b/drivers/net/i40e/i40e_hash.c
> @@ -386,6 +386,8 @@ i40e_hash_get_pattern_type(const struct rte_flow_item pattern[],
>  		prev_item_type = last_item_type;
>  		assert(last_item_type < (enum rte_flow_item_type)
>  				RTE_DIM(pattern_item_header));
> +		if (last_item_type >= RTE_DIM(pattern_item_header))
> +			goto not_sup;
>  		item_hdr = pattern_item_header[last_item_type];
>  		assert(item_hdr);
>  
>