FAILED: patch "[PATCH] cfg80211: correct bridge/4addr mode check" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Oct 30, 2021

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Stable branch 802.11 (including cfg80211/NL80211)

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2021-10-30 13:02 UTC #0 lore raw

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 689a0a9f505f7bffdefe6f17fddb41c8ab6344f6 Mon Sep 17 00:00:00 2001
From: Janusz Dziedzic <[email protected]>
Date: Sun, 24 Oct 2021 22:15:46 +0200
Subject: [PATCH] cfg80211: correct bridge/4addr mode check

Without the patch we fail:

$ sudo brctl addbr br0
$ sudo brctl addif br0 wlp1s0
$ sudo iw wlp1s0 set 4addr on
command failed: Device or resource busy (-16)

Last command failed but iface was already in 4addr mode.

Fixes ad4bb6f8883a ("cfg80211: disallow bridging managed/adhoc interfaces")

Signed-off-by Janusz Dziedzic <[email protected]>

Link https://lore.kernel.org/r/[email protected] open here

[add fixes tag, fix indentation, edit commit log]

Signed-off-by Johannes Berg <[email protected]>

net/wireless/util.c +7 -7

index 18dba3d7c638..a1a99a574984 100644
@@ -1028,14 +1028,14 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 	    !(rdev->wiphy.interface_modes & (1 << ntype)))
 		return -EOPNOTSUPP;
 
-	/* if it's part of a bridge, reject changing type to station/ibss */
-	if (netif_is_bridge_port(dev) &&
-	    (ntype == NL80211_IFTYPE_ADHOC ||
-	     ntype == NL80211_IFTYPE_STATION ||
-	     ntype == NL80211_IFTYPE_P2P_CLIENT))
-		return -EBUSY;
-
 	if (ntype != otype) {
+		/* if it's part of a bridge, reject changing type to station/ibss */
+		if (netif_is_bridge_port(dev) &&
+		    (ntype == NL80211_IFTYPE_ADHOC ||
+		     ntype == NL80211_IFTYPE_STATION ||
+		     ntype == NL80211_IFTYPE_P2P_CLIENT))
+			return -EBUSY;
+
 		dev->ieee80211_ptr->use_4addr = false;
 		dev->ieee80211_ptr->mesh_id_up_len = 0;
 		wdev_lock(dev->ieee80211_ptr);