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Date: Mon, 29 Jul 2019 08:52:50 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Parav Pandit <parav@...lanox.com>
Cc: Jia-Ju Bai <baijiaju1990@...il.com>,
"dledford@...hat.com" <dledford@...hat.com>,
"jgg@...pe.ca" <jgg@...pe.ca>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] infiniband: mlx5: a possible null-pointer dereference in
set_roce_addr()
On Mon, Jul 29, 2019 at 05:26:30AM +0000, Parav Pandit wrote:
>
>
> > -----Original Message-----
> > From: linux-kernel-owner@...r.kernel.org <linux-kernel-
> > owner@...r.kernel.org> On Behalf Of Parav Pandit
> > Sent: Monday, July 29, 2019 10:55 AM
> > To: Jia-Ju Bai <baijiaju1990@...il.com>; leon@...nel.org;
> > dledford@...hat.com; jgg@...pe.ca
> > Cc: linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org
> > Subject: RE: [BUG] infiniband: mlx5: a possible null-pointer dereference in
> > set_roce_addr()
> >
> > Hi Jia,
> >
> > > -----Original Message-----
> > > From: linux-rdma-owner@...r.kernel.org <linux-rdma-
> > > owner@...r.kernel.org> On Behalf Of Jia-Ju Bai
> > > Sent: Monday, July 29, 2019 7:47 AM
> > > To: leon@...nel.org; dledford@...hat.com; jgg@...pe.ca
> > > Cc: linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org
> > > Subject: [BUG] infiniband: mlx5: a possible null-pointer dereference
> > > in
> > > set_roce_addr()
> > >
> > > In set_roce_addr(), there is an if statement on line 589 to check
> > > whether gid is
> > > NULL:
> > > if (gid)
> > >
> > > When gid is NULL, it is used on line 613:
> > > return mlx5_core_roce_gid_set(..., gid->raw, ...);
> > >
> > > Thus, a possible null-pointer dereference may occur.
> > >
> > > This bug is found by a static analysis tool STCheck written by us.
> > >
> > While static checker is right, it is not a real bug, because gid->raw pointer
> > points to GID entry itself so when GID is NULL, gid->raw is NULL too.
> >
> > One way to suppress the static checker warning/error is below patch.
> > Will let Leon review it.
> >
> > > I do not know how to correctly fix this bug, so I only report it.
> > >
> > >
> > > Best wishes,
> > > Jia-Ju Bai
> >
> > From 30e055dba77e595bf88aebd3a9c75ed76bc9c65a Mon Sep 17 00:00:00
> > 2001
> > From: Parav Pandit <parav@...lanox.com>
> > Date: Mon, 29 Jul 2019 00:13:21 -0500
> > Subject: [PATCH] IB/mlx5: Avoid static checker warning for NULL access
> >
> > union ib_gid *gid and gid->raw pointers refers to the same address.
> > However some static checker reports this as possible NULL access warning in
> > call to mlx5_core_roce_gid_set().
> >
> > To suppress such warning, instead of working on raw GID element, expose API
> > using union ib_gid*.
> >
> > Reported-by: Jia-Ju Bai <baijiaju1990@...il.com>
> > Signed-off-by: Parav Pandit <parav@...lanox.com>
> > ---
> > drivers/infiniband/hw/mlx5/main.c | 2 +-
> > drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c | 12 +++++++-----
> > drivers/net/ethernet/mellanox/mlx5/core/lib/gid.c | 5 +++--
> > drivers/net/ethernet/mellanox/mlx5/core/rdma.c | 2 +-
> > include/linux/mlx5/driver.h | 4 +++-
> > 5 files changed, 15 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/infiniband/hw/mlx5/main.c
> > b/drivers/infiniband/hw/mlx5/main.c
> > index c2a5780cb394..e60785bad7ef 100644
> > --- a/drivers/infiniband/hw/mlx5/main.c
> > +++ b/drivers/infiniband/hw/mlx5/main.c
> > @@ -610,7 +610,7 @@ static int set_roce_addr(struct mlx5_ib_dev *dev, u8
> > port_num,
> > }
> >
> > return mlx5_core_roce_gid_set(dev->mdev, index, roce_version,
> > - roce_l3_type, gid->raw, mac,
> > + roce_l3_type, &gid, mac,
> > vlan_id < VLAN_CFI_MASK, vlan_id,
> > port_num);
> > }
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
> > index 4c50efe4e7f1..76b8236af9c7 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
> > @@ -850,6 +850,7 @@ struct mlx5_fpga_conn *mlx5_fpga_conn_create(struct
> > mlx5_fpga_device *fdev,
> > enum mlx5_ifc_fpga_qp_type
> > qp_type) {
> > struct mlx5_fpga_conn *ret, *conn;
> > + struct ib_gid remote_gid = {};
> > u8 *remote_mac, *remote_ip;
> > int err;
> >
> > @@ -876,11 +877,12 @@ struct mlx5_fpga_conn
> > *mlx5_fpga_conn_create(struct mlx5_fpga_device *fdev,
> > goto err;
> > }
> >
> > - /* Build Modified EUI-64 IPv6 address from the MAC address */
> > remote_ip = MLX5_ADDR_OF(fpga_qpc, conn->fpga_qpc, remote_ip);
> > - remote_ip[0] = 0xfe;
> > - remote_ip[1] = 0x80;
> > - addrconf_addr_eui48(&remote_ip[8], remote_mac);
> > + memcpy(remote_gid.raw[0], remote_ip, sizeof(remote_gid.raw));
> > + /* Build Modified EUI-64 IPv6 address from the MAC address */
> > + remte_gid.raw[0] = 0xfe;
> > + remte_gid.raw[1] = 0x80;
> > + addrconf_addr_eui48(&remote_gid.raw[8], remote_mac);
> >
> > err = mlx5_core_reserved_gid_alloc(fdev->mdev, &conn-
> > >qp.sgid_index);
> > if (err) {
> > @@ -892,7 +894,7 @@ struct mlx5_fpga_conn *mlx5_fpga_conn_create(struct
> > mlx5_fpga_device *fdev,
> > err = mlx5_core_roce_gid_set(fdev->mdev, conn->qp.sgid_index,
> > MLX5_ROCE_VERSION_2,
> > MLX5_ROCE_L3_TYPE_IPV6,
> > - remote_ip, remote_mac, true, 0,
> > + &remote_gid, remote_mac, true, 0,
> > MLX5_FPGA_PORT_NUM);
> > if (err) {
> > mlx5_fpga_err(fdev, "Failed to set SGID: %d\n", err); diff --git
> > a/drivers/net/ethernet/mellanox/mlx5/core/lib/gid.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/lib/gid.c
> > index 7722a3f9bb68..9b8563a2bd50 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/gid.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/gid.c
> > @@ -120,7 +120,8 @@ unsigned int mlx5_core_reserved_gids_count(struct
> > mlx5_core_dev *dev)
> > EXPORT_SYMBOL_GPL(mlx5_core_reserved_gids_count);
> >
> > int mlx5_core_roce_gid_set(struct mlx5_core_dev *dev, unsigned int index,
> > - u8 roce_version, u8 roce_l3_type, const u8 *gid,
> > + u8 roce_version, u8 roce_l3_type,
> > + const union ib_gid *gid,
> > const u8 *mac, bool vlan, u16 vlan_id, u8 port_num)
> > { #define MLX5_SET_RA(p, f, v) MLX5_SET(roce_addr_layout, p, f, v) @@ -
> > 145,7 +146,7 @@ int mlx5_core_roce_gid_set(struct mlx5_core_dev *dev,
> > unsigned int index,
> > ether_addr_copy(addr_mac, mac);
> > MLX5_SET_RA(in_addr, roce_version, roce_version);
> > MLX5_SET_RA(in_addr, roce_l3_type, roce_l3_type);
> > - memcpy(addr_l3_addr, gid, gidsz);
> > + memcpy(addr_l3_addr, &gid->raw[0], gidsz);
> > }
> >
> > if (MLX5_CAP_GEN(dev, num_vhca_ports) > 0) diff --git
> > a/drivers/net/ethernet/mellanox/mlx5/core/rdma.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/rdma.c
> > index 17ce9dd56b13..2a4467346231 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/rdma.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/rdma.c
> > @@ -139,7 +139,7 @@ static int mlx5_rdma_add_roce_addr(struct
> > mlx5_core_dev *dev)
> > mlx5_rdma_make_default_gid(dev, &gid);
> > return mlx5_core_roce_gid_set(dev, 0,
> > MLX5_ROCE_VERSION_1,
> > - 0, gid.raw, mac,
> > + 0, &gid, mac,
> > false, 0, 1);
> > }
> >
> > diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h index
> > 1e42c13819ae..691864e853be 100644
> > --- a/include/linux/mlx5/driver.h
> > +++ b/include/linux/mlx5/driver.h
> > @@ -47,6 +47,7 @@
> > #include <linux/interrupt.h>
> > #include <linux/idr.h>
> > #include <linux/notifier.h>
> > +#include <rdma/ib_verbs.h>
> >
> > #include <linux/mlx5/device.h>
> > #include <linux/mlx5/doorbell.h>
> > @@ -1002,7 +1003,8 @@ struct cpumask *
> > mlx5_comp_irq_get_affinity_mask(struct mlx5_core_dev *dev, int vector);
> > unsigned int mlx5_core_reserved_gids_count(struct mlx5_core_dev *dev); int
> > mlx5_core_roce_gid_set(struct mlx5_core_dev *dev, unsigned int index,
> > - u8 roce_version, u8 roce_l3_type, const u8 *gid,
> > + u8 roce_version, u8 roce_l3_type,
> > + const union ib_gid *gid,
> > const u8 *mac, bool vlan, u16 vlan_id, u8 port_num);
> >
> > static inline int fw_initializing(struct mlx5_core_dev *dev)
> > --
> > 2.19.2
>
> Leon just replied. Thanks.
Just to be clear, NAK.
Thanks
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