linux-kernel - [PATCH 4.19 07/12] mac80211: check return value of rhashtable

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Message-Id: <20211014145206.797805715@linuxfoundation.org>
Date:   Thu, 14 Oct 2021 16:54:07 +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, MichelleJin <shjy180909@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 07/12] mac80211: check return value of rhashtable_init

From: MichelleJin <shjy180909@...il.com>

[ Upstream commit 111461d573741c17eafad029ac93474fa9adcce0 ]

When rhashtable_init() fails, it returns -EINVAL.
However, since error return value of rhashtable_init is not checked,
it can cause use of uninitialized pointers.
So, fix unhandled errors of rhashtable_init.

Signed-off-by: MichelleJin <shjy180909@...il.com>
Link: https://lore.kernel.org/r/20210927033457.1020967-4-shjy180909@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/mesh_pathtbl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 6dc5f93b1e4d..06b44c3c831a 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -63,7 +63,10 @@ static struct mesh_table *mesh_table_alloc(void)
 	atomic_set(&newtbl->entries,  0);
 	spin_lock_init(&newtbl->gates_lock);
 	spin_lock_init(&newtbl->walk_lock);
-	rhashtable_init(&newtbl->rhead, &mesh_rht_params);
+	if (rhashtable_init(&newtbl->rhead, &mesh_rht_params)) {
+		kfree(newtbl);
+		return NULL;
+	}
 
 	return newtbl;
 }
-- 
2.33.0