[v4] app/pdump: check lcore is not the maximum core

Check lcore id value is not the maximum core supported.
Using lcore id without this check might cause
out of bound access inside the rte_eal_wait_lcore.

Coverity issue: 375841
Fixes: b2854d5317e8 ("app/pdump: support multi-core capture")
Cc: vipin.varghese@intel.com
Cc: stable@dpdk.org

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
---
v4: Remove inline of new function
    Change lcore type as unsigned int
    return lcore from the function
---
 app/pdump/main.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)
  

On Mon, 28 Feb 2022 09:58:56 +0000
Reshma Pattan <reshma.pattan@intel.com> wrote:

> Check lcore id value is not the maximum core supported.
> Using lcore id without this check might cause
> out of bound access inside the rte_eal_wait_lcore.
> 
> Coverity issue: 375841
> Fixes: b2854d5317e8 ("app/pdump: support multi-core capture")
> Cc: vipin.varghese@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>

Great thanks.

Acked-by: Stephen Hemminger <stephen@networkplumber.org>
  

Thomas, could you include this in RC3 if possible.

> -----Original Message-----
> From: Reshma Pattan <reshma.pattan@intel.com>
> Sent: Monday, February 28, 2022 9:59 AM
> To: dev@dpdk.org
> Cc: stephen@networkplumber.org; Yigit, Ferruh <ferruh.yigit@intel.com>;
> Pattan, Reshma <reshma.pattan@intel.com>; vipin.varghese@intel.com;
> stable@dpdk.org
> Subject: [PATCH v4] app/pdump: check lcore is not the maximum core
> 
> Check lcore id value is not the maximum core supported.
> Using lcore id without this check might cause out of bound access inside
> the rte_eal_wait_lcore.
> 
> Coverity issue: 375841
> Fixes: b2854d5317e8 ("app/pdump: support multi-core capture")
> Cc: vipin.varghese@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
> ---
> v4: Remove inline of new function
>     Change lcore type as unsigned int
>     return lcore from the function
> ---
>  app/pdump/main.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/app/pdump/main.c b/app/pdump/main.c index
> 04a38e8911..96fa76f8da 100644
> --- a/app/pdump/main.c
> +++ b/app/pdump/main.c
> @@ -900,11 +900,21 @@ dump_packets_core(void *arg)
>  	return 0;
>  }
> 
> +static unsigned int
> +get_next_core(unsigned int lcore)
> +{
> +	lcore = rte_get_next_lcore(lcore, 1, 0);
> +	if (lcore == RTE_MAX_LCORE)
> +		rte_exit(EXIT_FAILURE,
> +				"Max core limit %u reached for packet capture",
> lcore);
> +	return lcore;
> +}
> +
>  static inline void
>  dump_packets(void)
>  {
>  	int i;
> -	uint32_t lcore_id = 0;
> +	unsigned int lcore_id = 0;
> 
>  	if (!multiple_core_capture) {
>  		printf(" core (%u), capture for (%d) tuples\n", @@ -930,12
> +940,12 @@ dump_packets(void)
>  		return;
>  	}
> 
> -	lcore_id = rte_get_next_lcore(lcore_id, 1, 0);
> +	lcore_id = get_next_core(lcore_id);
> 
>  	for (i = 0; i < num_tuples; i++) {
>  		rte_eal_remote_launch(dump_packets_core,
>  				&pdump_t[i], lcore_id);
> -		lcore_id = rte_get_next_lcore(lcore_id, 1, 0);
> +		lcore_id = get_next_core(lcore_id);
> 
>  		if (rte_eal_wait_lcore(lcore_id) < 0)
>  			rte_exit(EXIT_FAILURE, "failed to wait\n");
> --
> 2.25.1
  

08/03/2022 14:47, Mcnamara, John:
> Thomas, could you include this in RC3 if possible.

I did already yesterday:
	https://git.dpdk.org/dpdk/commit/?id=3ee04ebc91

Looks like I forgot to send an email.

Applied, thanks :)
  

> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Subject: Re: [PATCH v4] app/pdump: check lcore is not the maximum core
> 
> 08/03/2022 14:47, Mcnamara, John:
> > Thomas, could you include this in RC3 if possible.
> 
> I did already yesterday:
> 	https://git.dpdk.org/dpdk/commit/?id=3ee04ebc91
> 
> Looks like I forgot to send an email.
> 
> Applied, thanks :)

Thank you. :-)