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wifi: nl80211: fix NULL-ptr deref in offchan check
author
Johannes Berg
<johannes.berg@intel.com>
Wed, 1 Mar 2023 10:09:29 +0000
(12:09 +0200)
committer
Johannes Berg
<johannes.berg@intel.com>
Fri, 10 Mar 2023 10:46:22 +0000
(11:46 +0100)
If, e.g. in AP mode, the link was already created by userspace
but not activated yet, it has a chandef but the chandef isn't
valid and has no channel. Check for this and ignore this link.
Fixes:
7b0a0e3c3a88
("wifi: cfg80211: do some rework towards MLO link APIs")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link:
https://lore.kernel.org/r/20230301115906.71bd4803fbb9.Iee39c0f6c2d3a59a8227674dc55d52e38b1090cf@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
net/wireless/nl80211.c
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diff --git
a/net/wireless/nl80211.c
b/net/wireless/nl80211.c
index
112b4bb
..
51f6582
100644
(file)
--- a/
net/wireless/nl80211.c
+++ b/
net/wireless/nl80211.c
@@
-8901,7
+8901,7
@@
static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *wdev,
struct cfg80211_chan_def *chandef;
chandef = wdev_chandef(wdev, link_id);
- if (!chandef)
+ if (!chandef
|| !chandef->chan
)
continue;
/*