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Date: Tue, 6 Dec 2016 18:57:21 +0200
From: Yuval Shaia <yuval.shaia@...cle.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, Dec 06, 2016 at 03:10:33PM +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
FWIW compiled also on SPARC
Reviewed-by: Yuval Shaia <yuval.shaia@...cle.com>
>
> 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;
> + nesvnic->linearized_skbs++;
> skb_set_transport_header(skb, hoffset);
> skb_set_network_header(skb, nhoffset);
> if (!nes_nic_send(skb, netdev))
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
> index 2a653ec..ab787cb 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
> @@ -490,7 +490,11 @@ int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
> */
> if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
> (fctl & FC_FC_END_SEQ)) {
> - skb_linearize(skb);
> + int err = 0;
> +
> + err = skb_linearize(skb);
> + if (err)
> + return err;
> crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
> crc->fcoe_eof = FC_EOF_T;
> }
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index fee1f29..4926d48 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -2173,8 +2173,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
> total_rx_bytes += ddp_bytes;
> total_rx_packets += DIV_ROUND_UP(ddp_bytes,
> mss);
> - }
> - if (!ddp_bytes) {
> + } else {
> dev_kfree_skb_any(skb);
> continue;
> }
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> index f9ddb61..197d02e 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c
> @@ -542,8 +542,11 @@ static void bnx2fc_recv_frame(struct sk_buff *skb)
> return;
> }
>
> - if (skb_is_nonlinear(skb))
> - skb_linearize(skb);
> + if (skb_linearize(skb)) {
> + kfree_skb(skb);
> + return;
> + }
> +
> mac = eth_hdr(skb)->h_source;
> dest_mac = eth_hdr(skb)->h_dest;
>
> diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
> index 9bd41a3..f691b97 100644
> --- a/drivers/scsi/fcoe/fcoe.c
> +++ b/drivers/scsi/fcoe/fcoe.c
> @@ -1685,7 +1685,10 @@ static void fcoe_recv_frame(struct sk_buff *skb)
> skb->dev ? skb->dev->name : "<NULL>");
>
> port = lport_priv(lport);
> - skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */
> + if (skb_linearize(skb)) {
> + kfree_skb(skb);
> + return;
> + }
>
> /*
> * Frame length checks and setting up the header pointers
> diff --git a/net/tipc/link.c b/net/tipc/link.c
> index bda89bf..077c570 100644
> --- a/net/tipc/link.c
> +++ b/net/tipc/link.c
> @@ -1446,7 +1446,8 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
> if (tipc_own_addr(l->net) > msg_prevnode(hdr))
> l->net_plane = msg_net_plane(hdr);
>
> - skb_linearize(skb);
> + if (skb_linearize(skb))
> + goto exit;
> hdr = buf_msg(skb);
> data = msg_data(hdr);
>
> diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
> index c1cfd92..4e05d2a 100644
> --- a/net/tipc/name_distr.c
> +++ b/net/tipc/name_distr.c
> @@ -356,7 +356,10 @@ void tipc_named_rcv(struct net *net, struct sk_buff_head *inputq)
>
> spin_lock_bh(&tn->nametbl_lock);
> for (skb = skb_dequeue(inputq); skb; skb = skb_dequeue(inputq)) {
> - skb_linearize(skb);
> + if (skb_linearize(skb)) {
> + kfree_skb(skb);
> + continue;
> + }
> msg = buf_msg(skb);
> mtype = msg_type(msg);
> item = (struct distr_item *)msg_data(msg);
> --
> 1.9.1
>
> --
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