netdev - RE: [PATCH net] qed: Use after free in qed_rdma

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Date:   Tue, 13 Mar 2018 09:40:18 +0000
From:   "Kalderon, Michal" <Michal.Kalderon@...ium.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Elior, Ariel" <Ariel.Elior@...ium.com>
CC:     Dept-Eng Everest Linux L2 <Dept-EngEverestLinuxL2@...ium.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH net] qed: Use after free in qed_rdma_free()

> From: Dan Carpenter [mailto:dan.carpenter@...cle.com]
> Sent: Tuesday, March 13, 2018 11:10 AM
> To: Elior, Ariel <Ariel.Elior@...ium.com>; Kalderon, Michal
> <Michal.Kalderon@...ium.com>
> Cc: Dept-Eng Everest Linux L2 <Dept-EngEverestLinuxL2@...ium.com>;
> netdev@...r.kernel.org; kernel-janitors@...r.kernel.org
> Subject: [PATCH net] qed: Use after free in qed_rdma_free()
> 
> We're dereferencing "p_hwfn->p_rdma_info" but that is freed on the line
> before in qed_rdma_resc_free(p_hwfn).
> 
> Fixes: 9de506a547c0 ("qed: Free RoCE ILT Memory on rmmod qedr")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> index f3ee6538b553..a411f9c702a1 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_rdma.c
> @@ -379,8 +379,8 @@ static void qed_rdma_free(struct qed_hwfn
> *p_hwfn)
>  	DP_VERBOSE(p_hwfn, QED_MSG_RDMA, "Freeing RDMA\n");
> 
>  	qed_rdma_free_reserved_lkey(p_hwfn);
> -	qed_rdma_resc_free(p_hwfn);
>  	qed_cxt_free_proto_ilt(p_hwfn, p_hwfn->p_rdma_info->proto);
> +	qed_rdma_resc_free(p_hwfn);
>  }
> 
>  static void qed_rdma_get_guid(struct qed_hwfn *p_hwfn, u8 *guid)
Thanks,

Acked-by: Michal Kalderon <Michal.Kalderon@...ium.com>