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From: "Wang, Haiyue" <haiyue.wang@intel.com>
To: "Yu, DapengX" <dapengx.yu@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] net/ixgbe: fix using heap pointer after free
Date: Fri, 9 Jul 2021 02:49:07 +0000	[thread overview]
Message-ID: <BN8PR11MB37953B0BA1C155BC230E7BACF7189@BN8PR11MB3795.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20210709023022.847686-1-dapengx.yu@intel.com>

> -----Original Message-----
> From: Yu, DapengX <dapengx.yu@intel.com>
> Sent: Friday, July 9, 2021 10:30
> To: Wang, Haiyue <haiyue.wang@intel.com>
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: [PATCH] net/ixgbe: fix using heap pointer after free
> 
> From: Dapeng Yu <dapengx.yu@intel.com>
> 
> The original code use a heap pointer after it is freed.
> This patch fix it.
> 
> Fixes: a14de8b498d1 ("net/ixgbe: destroy consistent filter")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> ---
>  drivers/net/ixgbe/ixgbe_flow.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ixgbe/ixgbe_flow.c b/drivers/net/ixgbe/ixgbe_flow.c
> index 0b10e91a9b..4db5ef4b2b 100644
> --- a/drivers/net/ixgbe/ixgbe_flow.c
> +++ b/drivers/net/ixgbe/ixgbe_flow.c
> @@ -32,6 +32,7 @@
>  #include <rte_hash_crc.h>
>  #include <rte_flow.h>
>  #include <rte_flow_driver.h>
> +#include <rte_tailq.h>
> 
>  #include "ixgbe_logs.h"
>  #include "base/ixgbe_api.h"
> @@ -3339,6 +3340,7 @@ ixgbe_flow_destroy(struct rte_eth_dev *dev,
>  	struct ixgbe_hw_fdir_info *fdir_info =
>  		IXGBE_DEV_PRIVATE_TO_FDIR_INFO(dev->data->dev_private);
>  	struct ixgbe_rss_conf_ele *rss_filter_ptr;
> +	void *tmp;
> 
>  	switch (filter_type) {
>  	case RTE_ETH_FILTER_NTUPLE:
> @@ -3432,7 +3434,7 @@ ixgbe_flow_destroy(struct rte_eth_dev *dev,
>  		return ret;
>  	}
> 
> -	TAILQ_FOREACH(ixgbe_flow_mem_ptr, &ixgbe_flow_list, entries) {
> +	TAILQ_FOREACH_SAFE(ixgbe_flow_mem_ptr, &ixgbe_flow_list, entries, tmp) {
>  		if (ixgbe_flow_mem_ptr->flow == pmd_flow) {
>  			TAILQ_REMOVE(&ixgbe_flow_list,
>  				ixgbe_flow_mem_ptr, entries);

This is "find - free" process, and only one 'pmd_flow' in the list,
so just "break;" is fine.

	TAILQ_FOREACH(ixgbe_flow_mem_ptr, &ixgbe_flow_list, entries) {
		if (ixgbe_flow_mem_ptr->flow == pmd_flow) {
			TAILQ_REMOVE(&ixgbe_flow_list,
				ixgbe_flow_mem_ptr, entries);
			rte_free(ixgbe_flow_mem_ptr);
			break; <------
		}
	}

> --
> 2.27.0


  reply	other threads:[~2021-07-09  2:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-09  2:30 dapengx.yu
2021-07-09  2:49 ` Wang, Haiyue [this message]
2021-07-09  3:14 ` [dpdk-dev] [PATCH v2] " dapengx.yu
2021-07-09  4:35   ` Wang, Haiyue
2021-07-09  7:29     ` Zhang, Qi Z

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