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wext: call cfg80211_change_iface() with wiphy lock held 

This is needed now that all the driver callbacks are protected by
the wiphy lock rather than (just) the RTNL.

Fixes: a05829a722 ("cfg80211: avoid holding the RTNL when calling the driver")
Reported-by: syzbot+d2d412349f88521938aa@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20210128183454.e81bc6789b4b.I5deb8b6bfdc8b4ea7696cb2447ee6c58c7ce9a4e@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2021-01-28 18:35:26 +01:00
parent 0391a45c80
commit bae173563c
1 changed files with 6 additions and 1 deletions
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7
net/wireless/wext-compat.c
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@ -39,6 +39,7 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
struct cfg80211_registered_device *rdev;
struct vif_params vifparams;
enum nl80211_iftype type;
int ret;
rdev = wiphy_to_rdev(wdev->wiphy);
@ -61,7 +62,11 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
memset(&vifparams, 0, sizeof(vifparams));
return cfg80211_change_iface(rdev, dev, type, &vifparams);
wiphy_lock(wdev->wiphy);
ret = cfg80211_change_iface(rdev, dev, type, &vifparams);
wiphy_unlock(wdev->wiphy);
return ret;
}
EXPORT_WEXT_HANDLER(cfg80211_wext_siwmode);