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Message-ID: <20230925192351.40744-1-jeremy@jcline.org>
Date: Mon, 25 Sep 2023 15:23:51 -0400
From: Jeremy Cline <jeremy@...ine.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: "David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Lin Ma <linma@....edu.cn>,
Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Jeremy Cline <jeremy@...ine.org>,
syzbot+c1d0a03d305972dbbe14@...kaller.appspotmail.com
Subject: [PATCH v2 net] net: nfc: llcp: Add lock when modifying device list
The device list needs its associated lock held when modifying it, or the
list could become corrupted, as syzbot discovered.
Reported-and-tested-by: syzbot+c1d0a03d305972dbbe14@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=c1d0a03d305972dbbe14
Fixes: 6709d4b7bc2e ("net: nfc: Fix use-after-free caused by nfc_llcp_find_local")
Signed-off-by: Jeremy Cline <jeremy@...ine.org>
---
Changes from v1: added the correct Fixes tag
net/nfc/llcp_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/nfc/llcp_core.c b/net/nfc/llcp_core.c
index f60e424e0607..6705bb895e23 100644
--- a/net/nfc/llcp_core.c
+++ b/net/nfc/llcp_core.c
@@ -1636,7 +1636,9 @@ int nfc_llcp_register_device(struct nfc_dev *ndev)
timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
+ spin_lock(&llcp_devices_lock);
list_add(&local->list, &llcp_devices);
+ spin_unlock(&llcp_devices_lock);
return 0;
}
--
2.41.0
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