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cfg80211: allow vendor dumpit to terminate by returning 0 

nl80211 vendor netlink dumpit, like netlink_callback->dump, should
signal successful completion by returning 0.

Currently, that will just cause dumpit to be called again, possibly
many times until an error occurs.  Since skb->len is never going to be
0 by the time dumpit is called, the only way for dumpit to signal
completion is by returning an error.  If it returns a positive value,
the current message is cancelled, but that positive value is returned
and nl80211_vendor_cmd_dump gets called again.

Fix that by passing a return value of 0 through.

Signed-off-by: Julian Squires <julian@cipht.net>
Link: https://lore.kernel.org/r/20200720145033.401307-1-julian@cipht.net
[reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Julian Squires 2020-07-20 12:20:35 -02:30 committed by Johannes Berg
parent f2a0c18759
commit 9c167b2ddc
1 changed files with 1 additions and 1 deletions
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2
net/wireless/nl80211.c
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@ -13479,7 +13479,7 @@ static int nl80211_vendor_cmd_dump(struct sk_buff *skb,
if (err == -ENOBUFS || err == -ENOENT) {
genlmsg_cancel(skb, hdr);
break;
} else if (err) {
} else if (err <= 0) {
genlmsg_cancel(skb, hdr);
goto out;
}