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aa9be386d4
fetched from upstream kernel v5.15.67 Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
48 lines
1.9 KiB
Diff
48 lines
1.9 KiB
Diff
From 552ba102a6898630a7d16887f29e606d6fabe508 Mon Sep 17 00:00:00 2001
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From: Siddh Raman Pant <code@siddh.me>
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Date: Sun, 14 Aug 2022 20:45:12 +0530
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Subject: [PATCH] wifi: mac80211: Don't finalize CSA in IBSS mode if state is
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disconnected
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commit 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0 upstream.
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When we are not connected to a channel, sending channel "switch"
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announcement doesn't make any sense.
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The BSS list is empty in that case. This causes the for loop in
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cfg80211_get_bss() to be bypassed, so the function returns NULL
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(check line 1424 of net/wireless/scan.c), causing the WARN_ON()
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in ieee80211_ibss_csa_beacon() to get triggered (check line 500
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of net/mac80211/ibss.c), which was consequently reported on the
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syzkaller dashboard.
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Thus, check if we have an existing connection before generating
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the CSA beacon in ieee80211_ibss_finish_csa().
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Cc: stable@vger.kernel.org
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Fixes: cd7760e62c2a ("mac80211: add support for CSA in IBSS mode")
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Link: https://syzkaller.appspot.com/bug?id=05603ef4ae8926761b678d2939a3b2ad28ab9ca6
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Reported-by: syzbot+b6c9fe29aefe68e4ad34@syzkaller.appspotmail.com
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Signed-off-by: Siddh Raman Pant <code@siddh.me>
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Tested-by: syzbot+b6c9fe29aefe68e4ad34@syzkaller.appspotmail.com
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Link: https://lore.kernel.org/r/20220814151512.9985-1-code@siddh.me
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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net/mac80211/ibss.c | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/net/mac80211/ibss.c
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+++ b/net/mac80211/ibss.c
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@@ -534,6 +534,10 @@ int ieee80211_ibss_finish_csa(struct iee
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sdata_assert_lock(sdata);
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+ /* When not connected/joined, sending CSA doesn't make sense. */
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+ if (ifibss->state != IEEE80211_IBSS_MLME_JOINED)
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+ return -ENOLINK;
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+
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/* update cfg80211 bss information with the new channel */
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if (!is_zero_ether_addr(ifibss->bssid)) {
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cbss = cfg80211_get_bss(sdata->local->hw.wiphy,
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