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Message-Id: <20220607164920.717099002@linuxfoundation.org>
Date: Tue, 7 Jun 2022 19:04:25 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Xiaomeng Tong <xiam0nd.tong@...il.com>,
Christian Lamparter <chunkeey@...il.com>,
Kalle Valo <quic_kvalo@...cinc.com>
Subject: [PATCH 5.10 408/452] carl9170: tx: fix an incorrect use of list iterator
From: Xiaomeng Tong <xiam0nd.tong@...il.com>
commit 54a6f29522da3c914da30e50721dedf51046449a upstream.
If the previous list_for_each_entry_continue_rcu() don't exit early
(no goto hit inside the loop), the iterator 'cvif' after the loop
will be a bogus pointer to an invalid structure object containing
the HEAD (&ar->vif_list). As a result, the use of 'cvif' after that
will lead to a invalid memory access (i.e., 'cvif->id': the invalid
pointer dereference when return back to/after the callsite in the
carl9170_update_beacon()).
The original intention should have been to return the valid 'cvif'
when found in list, NULL otherwise. So just return NULL when no
entry found, to fix this bug.
Cc: stable@...r.kernel.org
Fixes: 1f1d9654e183c ("carl9170: refactor carl9170_update_beacon")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
Acked-by: Christian Lamparter <chunkeey@...il.com>
Signed-off-by: Kalle Valo <quic_kvalo@...cinc.com>
Link: https://lore.kernel.org/r/20220328122820.1004-1-xiam0nd.tong@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/wireless/ath/carl9170/tx.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/net/wireless/ath/carl9170/tx.c
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -1557,6 +1557,9 @@ static struct carl9170_vif_info *carl917
goto out;
}
} while (ar->beacon_enabled && i--);
+
+ /* no entry found in list */
+ return NULL;
}
out:
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