From: Nicolai Stange <nstange@suse.de>
Date: Tue, 14 Jan 2020 10:39:02 +0000 (+0100)
Subject: libertas: don't exit from lbs_ibss_join_existing() with RCU read lock held
X-Git-Tag: v5.5.4~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=847e6a7618019356de6c58760169b3991c12a9d0;p=users%2Fdwmw2%2Flinux.git

libertas: don't exit from lbs_ibss_join_existing() with RCU read lock held

[ Upstream commit c7bf1fb7ddca331780b9a733ae308737b39f1ad4 ]

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@suse.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/wireless/marvell/libertas/cfg.c b/drivers/net/wireless/marvell/libertas/cfg.c
index c9401c121a14e..68985d7663491 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;