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mctp: Warn if pointer is set for a wrong dev type

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Should not occur but is a sanity check.

May help tracking down Trinity reported issue
https://lore.kernel.org/lkml/20210913030701.GA5926@xsang-OptiPlex-9020/

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Johnston 2021-09-29 15:26:14 +08:00 committed by David S. Miller
parent 6183569db8
commit 7b1871af75
1 changed files with 24 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

31
net/mctp/device.c
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@ -337,12 +337,26 @@ static int mctp_set_link_af(struct net_device *dev, const struct nlattr *attr,
return 0; return 0;
} }
/* Matches netdev types that should have MCTP handling */
static bool mctp_known(struct net_device *dev)
{
/* only register specific types (inc. NONE for TUN devices) */
return dev->type == ARPHRD_MCTP ||
dev->type == ARPHRD_LOOPBACK ||
dev->type == ARPHRD_NONE;
}
static void mctp_unregister(struct net_device *dev) static void mctp_unregister(struct net_device *dev)
{ {
struct mctp_dev *mdev; struct mctp_dev *mdev;
mdev = mctp_dev_get_rtnl(dev); mdev = mctp_dev_get_rtnl(dev);
if (mctp_known(dev) != (bool)mdev) {
// Sanity check, should match what was set in mctp_register
netdev_warn(dev, "%s: mdev pointer %d but type (%d) match is %d",
__func__, (bool)mdev, mctp_known(dev), dev->type);
return;
}
if (!mdev) if (!mdev)
return; return;
@ -360,16 +374,19 @@ static int mctp_register(struct net_device *dev)
struct mctp_dev *mdev; struct mctp_dev *mdev;
/* Already registered? */ /* Already registered? */
if (rtnl_dereference(dev->mctp_ptr)) mdev = rtnl_dereference(dev->mctp_ptr);
return 0;
/* only register specific types (inc. NONE for TUN devices) */ if (mdev) {
if (!(dev->type == ARPHRD_MCTP || if (!mctp_known(dev))
dev->type == ARPHRD_LOOPBACK || netdev_warn(dev, "%s: mctp_dev set for unknown type %d",
dev->type == ARPHRD_NONE)) { __func__, dev->type);
return 0; return 0;
} }
/* only register specific types */
if (!mctp_known(dev))
return 0;
mdev = mctp_add_dev(dev); mdev = mctp_add_dev(dev);
if (IS_ERR(mdev)) if (IS_ERR(mdev))
return PTR_ERR(mdev); return PTR_ERR(mdev);