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Revert "wext: Fix 32 bit iwpriv compatibility issue with 64 bit Kernel"

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This reverts commit 3d5fdff46c.

Ben Hutchings pointed out that the commit isn't safe since it assumes
that the structure used by the driver is iw_point, when in fact there's
no way to know about that.

Fortunately, the only driver in the tree that ever runs this code path
is the wilc1000 staging driver, so it doesn't really matter.

Clearly I should have investigated this better before applying, sorry.

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@vger.kernel.org [though I guess it doesn't matter much]
Fixes: 3d5fdff46c ("wext: Fix 32 bit iwpriv compatibility issue with 64 bit Kernel")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-08-08 08:45:33 +02:00
parent 2439ca0402
commit 4d0bd46a4d
1 changed files with 2 additions and 23 deletions
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25
net/wireless/wext-core.c
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@ -958,29 +958,8 @@ static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
return private(dev, iwr, cmd, info, handler);
}
/* Old driver API : call driver ioctl handler */
if (dev->netdev_ops->ndo_do_ioctl) {
#ifdef CONFIG_COMPAT
if (info->flags & IW_REQUEST_FLAG_COMPAT) {
int ret = 0;
struct iwreq iwr_lcl;
struct compat_iw_point *iwp_compat = (void *) &iwr->u.data;
memcpy(&iwr_lcl, iwr, sizeof(struct iwreq));
iwr_lcl.u.data.pointer = compat_ptr(iwp_compat->pointer);
iwr_lcl.u.data.length = iwp_compat->length;
iwr_lcl.u.data.flags = iwp_compat->flags;
ret = dev->netdev_ops->ndo_do_ioctl(dev, (void *) &iwr_lcl, cmd);
iwp_compat->pointer = ptr_to_compat(iwr_lcl.u.data.pointer);
iwp_compat->length = iwr_lcl.u.data.length;
iwp_compat->flags = iwr_lcl.u.data.flags;
return ret;
} else
#endif
return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
}
if (dev->netdev_ops->ndo_do_ioctl)
return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
return -EOPNOTSUPP;
}