[PATCH 2/2] app/testpmd: fix stack overflow for EEPROM display

[Singh, Aman Deep]

Hi Steve
The patch looks ok to me.

On 1/20/2022 8:29 AM, Steve Yang wrote:
> When the size of EEPROM exceeds the default thread stack size(8MB),
> e.g.: 10Mb size, it will be cashed with stack overflow.
Just spelling: 10Mb/10MB, cashed/crashed
Can even rephrase, like: it will crash due to stack overflow
> Allocate the data of EPPROM information on the heap.
>
> Fixes: 6b67721dee2a ("app/testpmd: add EEPROM command")
>
> Signed-off-by: Steve Yang<stevex.yang at intel.com>

Acked-by: Aman Singh <aman.deep.singh at intel.com>

> ---
>   app/test-pmd/config.c | 22 ++++++++++++++++++----
>   1 file changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
> index 1722d6c8f8..e812f57151 100644
> --- a/app/test-pmd/config.c
> +++ b/app/test-pmd/config.c
> @@ -912,10 +912,15 @@ port_eeprom_display(portid_t port_id)
>   		return;
>   	}
>   
> -	char buf[len_eeprom];
>   	einfo.offset = 0;
>   	einfo.length = len_eeprom;
> -	einfo.data = buf;
> +	einfo.data = calloc(1, len_eeprom);
> +	if (!einfo.data) {
> +		fprintf(stderr,
> +			"Allocation of port %u eeprom data failed\n",
> +			port_id);
> +		return;
> +	}
>   
>   	ret = rte_eth_dev_get_eeprom(port_id, &einfo);
>   	if (ret != 0) {
> @@ -933,10 +938,12 @@ port_eeprom_display(portid_t port_id)
>   			fprintf(stderr, "Unable to get EEPROM: %d\n", ret);
>   			break;
>   		}
> +		free(einfo.data);
>   		return;
>   	}
>   	rte_hexdump(stdout, "hexdump", einfo.data, einfo.length);
>   	printf("Finish -- Port: %d EEPROM length: %d bytes\n", port_id, len_eeprom); + free(einfo.data); } void @@ -972,10 +979,15 
> @@ port_module_eeprom_display(portid_t port_id) return; } - char 
> buf[minfo.eeprom_len]; einfo.offset = 0; einfo.length = 
> minfo.eeprom_len; - einfo.data = buf; + einfo.data = calloc(1, 
> minfo.eeprom_len); + if (!einfo.data) { + fprintf(stderr, + "Allocation of port %u eeprom data failed\n",
> +			port_id);
> +		return;
> +	}
>   
>   	ret = rte_eth_dev_get_module_eeprom(port_id, &einfo);
>   	if (ret != 0) {
> @@ -994,11 +1006,13 @@ port_module_eeprom_display(portid_t port_id)
>   				ret);
>   			break;
>   		}
> +		free(einfo.data);
>   		return;
>   	}
>   
>   	rte_hexdump(stdout, "hexdump", einfo.data, einfo.length);
>   	printf("Finish -- Port: %d MODULE EEPROM length: %d bytes\n", port_id, einfo.length);
> +	free(einfo.data);
>   }
>   
>   int
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