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mac802154: Avoid rtnl deadlock in mac802154_wpan_ioctl().

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->ndo_do_ioctl() can be entered with the rtnl lock already held,
for example when sending a wext ioctl to a device (in which case
the rtnl lock is taken by wext_ioctl_dispatch()), but
mac802154_wpan_ioctl() currently unconditionally takes the rtnl
lock on entry, which can cause deadlocks.

To fix this, bail out of mac802154_wpan_ioctl() before taking the
rtnl lock if the ioctl cmd is not one of the cmds we implement.

Signed-off-by: Lennert Buytenhek <[email protected]>
Acked-by: Alexander Aring <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
This commit is contained in:
Lennert Buytenhek 2015-05-26 15:06:10 +03:00 • committed by Marcel Holtmann
commit e34fd879f5
1 changed files with 3 additions and 0 deletions
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3
net/mac802154/iface.c
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@ -62,6 +62,9 @@ mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
int err = -ENOIOCTLCMD;
if (cmd != SIOCGIFADDR && cmd != SIOCSIFADDR)
return err;
rtnl_lock();
switch (cmd) {