This is a note to let you know that I've just added the patch titled
wifi: mac80211: prohibit deactivating all links
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mac80211-prohibit-deactivating-all-links.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0e70b5fd34fe6d9e1651c3cffa97e1216b313302
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date: Mon Dec 30 09:14:07 2024 +0100
wifi: mac80211: prohibit deactivating all links
[ Upstream commit 7553477cbfd784b128297f9ed43751688415bbaa ]
In the internal API this calls this is a WARN_ON, but that
should remain since internally we want to know about bugs
that may cause this. Prevent deactivating all links in the
debugfs write directly.
Reported-by: syzbot+0c5d8e65f23569a8ffec@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 3d9011029227 ("wifi: mac80211: implement link switching")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Link: https://patch.msgid.link/20241230091408.505bd125c35a.Ic3c1f9572b980a952a444cad62b09b9c6721732b@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 63250286dc8b7..d6938ffd764ca 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -616,7 +616,7 @@ static ssize_t ieee80211_if_parse_active_links(struct ieee80211_sub_if_data *sda
{
u16 active_links;
- if (kstrtou16(buf, 0, &active_links))
+ if (kstrtou16(buf, 0, &active_links) || !active_links)
return -EINVAL;
return ieee80211_set_active_links(&sdata->vif, active_links) ?: buflen;
