linux-kernel - Re: [PATCH] net: return value of skb_linearize should be handled in Linux kernel

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Date:   Tue, 06 Dec 2016 22:51:19 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Zhouyi Zhou <zhouzhouyi@...il.com>
Cc:     faisal.latif@...el.com, dledford@...hat.com, sean.hefty@...el.com,
        hal.rosenstock@...il.com, jeffrey.t.kirsher@...el.com,
        QLogic-Storage-Upstream@...gic.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, jth@...nel.org, jon.maloy@...csson.com,
        ying.xue@...driver.com, davem@...emloft.net,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, fcoe-devel@...n-fcoe.org,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH] net: return value of skb_linearize should be handled in
 Linux kernel

On Tue, 2016-12-06 at 15:10 +0800, Zhouyi Zhou wrote:
> kmalloc_reserve may fail to allocate memory inside skb_linearize, 
> which means skb_linearize's return value should not be ignored. 
> Following patch correct the uses of skb_linearize.
> 
> Compiled in x86_64
> 
> Signed-off-by: Zhouyi Zhou <zhouzhouyi@...il.com>
> ---
>  drivers/infiniband/hw/nes/nes_nic.c           | 5 +++--
>  drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c | 6 +++++-
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 +--
>  drivers/scsi/bnx2fc/bnx2fc_fcoe.c             | 7 +++++--
>  drivers/scsi/fcoe/fcoe.c                      | 5 ++++-
>  net/tipc/link.c                               | 3 ++-
>  net/tipc/name_distr.c                         | 5 ++++-
>  7 files changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/nes/nes_nic.c b/drivers/infiniband/hw/nes/nes_nic.c
> index 2b27d13..69372ea 100644
> --- a/drivers/infiniband/hw/nes/nes_nic.c
> +++ b/drivers/infiniband/hw/nes/nes_nic.c
> @@ -662,10 +662,11 @@ static int nes_netdev_start_xmit(struct sk_buff *skb, struct net_device *netdev)
>  				nesnic->sq_head &= nesnic->sq_size-1;
>  			}
>  		} else {
> -			nesvnic->linearized_skbs++;
>  			hoffset = skb_transport_header(skb) - skb->data;
>  			nhoffset = skb_network_header(skb) - skb->data;
> -			skb_linearize(skb);
> +			if (skb_linearize(skb))
> +				return NETDEV_TX_BUSY;

This would live lock.

Please drop the packet.

You probably should send one patch per driver, to ease code review and
acceptance.