linux-kernel - [PATCH 1/2] libertas: don't exit from lbs_ibss_join

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Message-Id: <20200114103903.2336-2-nstange@suse.de>
Date:   Tue, 14 Jan 2020 11:39:02 +0100
From:   Nicolai Stange <nstange@...e.de>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Wen Huang <huangwenabc@...il.com>,
        Nicolai Stange <nstange@...e.de>,
        libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>, Miroslav Benes <mbenes@...e.cz>
Subject: [PATCH 1/2] libertas: don't exit from lbs_ibss_join_existing() with RCU read lock held

Commit e5e884b42639 ("libertas: Fix two buffer overflows at parsing bss
descriptor") introduced a bounds check on the number of supplied rates to
lbs_ibss_join_existing().

Unfortunately, it introduced a return path from within a RCU read side
critical section without a corresponding rcu_read_unlock(). Fix this.

Fixes: e5e884b42639 ("libertas: Fix two buffer overflows at parsing bss
                      descriptor")
Signed-off-by: Nicolai Stange <nstange@...e.de>
---
 drivers/net/wireless/marvell/libertas/cfg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/marvell/libertas/cfg.c b/drivers/net/wireless/marvell/libertas/cfg.c
index c9401c121a14..68985d766349 100644
--- a/drivers/net/wireless/marvell/libertas/cfg.c
+++ b/drivers/net/wireless/marvell/libertas/cfg.c
@@ -1785,6 +1785,7 @@ static int lbs_ibss_join_existing(struct lbs_private *priv,
 		rates_max = rates_eid[1];
 		if (rates_max > MAX_RATES) {
 			lbs_deb_join("invalid rates");
+			rcu_read_unlock();
 			goto out;
 		}
 		rates = cmd.bss.rates;
-- 
2.16.4