6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg johannes.berg@intel.com
[ 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@syzkaller.appspotmail.com Fixes: 3d9011029227 ("wifi: mac80211: implement link switching") Signed-off-by: Johannes Berg johannes.berg@intel.com Link: https://patch.msgid.link/20241230091408.505bd125c35a.Ic3c1f9572b980a952a444c... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mac80211/debugfs_netdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c index 68596ef78b15e..d0b145888e139 100644 --- a/net/mac80211/debugfs_netdev.c +++ b/net/mac80211/debugfs_netdev.c @@ -728,7 +728,7 @@ 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;