cfg80211: check for set_wiphy_params

BugLink: https://bugs.launchpad.net/bugs/1862259
commit 24953de0a5e31dcca7e82c8a3c79abc2dfe8fb6e upstream.

Check if set_wiphy_params is assigned and return an error if not,
some drivers (e.g. virt_wifi where syzbot reported it) don't have
it.

Reported-by: syzbot+e8a797964a4180eb57d5@syzkaller.appspotmail.com
Reported-by: syzbot+34b582cf32c1db008f8e@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200113125358.ac07f276efff.Ibd85ee1b12e47b9efb00a2adc5cd3fac50da791a@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/wireless/rdev-ops.h b/net/wireless/rdev-ops.h
index 0c06240d25afc9da33ddd23c09c719cd2c06ebce..249919bdfc64ed277185911ffc4645f59a1fcdff 100644 (file)
--- a/net/wireless/rdev-ops.h
+++ b/net/wireless/rdev-ops.h
@@ -537,6 +537,10 @@ static inline int
 rdev_set_wiphy_params(struct cfg80211_registered_device *rdev, u32 changed)
 {
        int ret;
+
+       if (!rdev->ops->set_wiphy_params)
+               return -EOPNOTSUPP;
+
        trace_rdev_set_wiphy_params(&rdev->wiphy, changed);
        ret = rdev->ops->set_wiphy_params(&rdev->wiphy, changed);
        trace_rdev_return_int(&rdev->wiphy, ret);