linux-kernel - RE: [EXT] [PATCH] qed: Add cleanup in qed_slowpath

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Message-ID: <MN2PR18MB2528D8046DFC6BB880D8EFF6D3D20@MN2PR18MB2528.namprd18.prod.outlook.com>
Date:   Tue, 13 Aug 2019 10:46:36 +0000
From:   Sudarsana Reddy Kalluru <skalluru@...vell.com>
To:     Wenwen Wang <wenwen@...uga.edu>
CC:     Ariel Elior <aelior@...vell.com>,
        GR-everest-linux-l2 <GR-everest-linux-l2@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:QLOGIC QL4xxx ETHERNET DRIVER" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH] qed: Add cleanup in qed_slowpath_start()

> -----Original Message-----
> From: Wenwen Wang <wenwen@...uga.edu>
> Sent: Tuesday, August 13, 2019 3:35 PM
> To: Wenwen Wang <wenwen@...uga.edu>
> Cc: Ariel Elior <aelior@...vell.com>; GR-everest-linux-l2 <GR-everest-linux-
> l2@...vell.com>; David S. Miller <davem@...emloft.net>; open
> list:QLOGIC QL4xxx ETHERNET DRIVER <netdev@...r.kernel.org>; open list
> <linux-kernel@...r.kernel.org>
> Subject: [EXT] [PATCH] qed: Add cleanup in qed_slowpath_start()
> 
> External Email
> 
> ----------------------------------------------------------------------
> If qed_mcp_send_drv_version() fails, no cleanup is executed, leading to
> memory leaks. To fix this issue, redirect the execution to the label 'err3'
> before returning the error.
> 
> Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
> ---
>  drivers/net/ethernet/qlogic/qed/qed_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c
> b/drivers/net/ethernet/qlogic/qed/qed_main.c
> index 829dd60..d16a251 100644
> --- a/drivers/net/ethernet/qlogic/qed/qed_main.c
> +++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
> @@ -1325,7 +1325,7 @@ static int qed_slowpath_start(struct qed_dev
> *cdev,
>  					      &drv_version);
>  		if (rc) {
>  			DP_NOTICE(cdev, "Failed sending drv version
> command\n");
> -			return rc;
> +			goto err3;

In this case, we might need to free the ll2-buf allocated at the below path (?),
1312         /* Allocate LL2 interface if needed */
1313         if (QED_LEADING_HWFN(cdev)->using_ll2) {
1314                 rc = qed_ll2_alloc_if(cdev);
May be by adding a new goto label 'err4'.

>  		}
>  	}
> 
> --
> 2.7.4