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[2/2] wifi: mac80211: check link exists before use

Message ID 20240301193633.c886d300e90a.Ie1d5e23b2a033d934d343c37249f6f4dfddcc5fe@changeid
State New
Headers show
Series [1/2] wifi: mac80211: always initialize match_auth | expand

Commit Message

Johannes Berg March 1, 2024, 6:36 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

If the assoc link doesn't exist yet at this point, we
cannot use it yet. This isn't normally the case, but
e.g. in case of FT-DS (or just broken userspace) the
link might not be set up yet and will only be created
later in this function. Check that the link exists.

Fixes: 310c8387c638 ("wifi: mac80211: clean up connection process")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/3151f5d0-c18f-413d-b34b-b94f095b947c@moroto.mountain
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 net/mac80211/mlme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 89c4165f2753..c60d23da91fe 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -8173,7 +8173,7 @@  int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
 				eth_random_addr(assoc_data->link[i].addr);
 			sband = local->hw.wiphy->bands[link_cbss->channel->band];
 
-			if (match_auth && i == assoc_link_id)
+			if (match_auth && i == assoc_link_id && link)
 				assoc_data->link[i].conn = link->u.mgd.conn;
 			else
 				assoc_data->link[i].conn =