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Date: Mon, 9 Oct 2023 15:08:58 +0200
From: Krzysztof Kozlowski <>
To: Eric Dumazet <>, "David S . Miller"
 <>, Jakub Kicinski <>,
 Paolo Abeni <>
 Sili Luo <>, Willy Tarreau <>
Subject: Re: [PATCH net] net: nfc: fix races in nfc_llcp_sock_get() and

On 09/10/2023 14:31, Eric Dumazet wrote:
> Sili Luo reported a race in nfc_llcp_sock_get(), leading to UAF.
> Getting a reference on the socket found in a lookup while
> holding a lock should happen before releasing the lock.
> nfc_llcp_sock_get_sn() has a similar problem.
> Finally nfc_llcp_recv_snl() needs to make sure the socket
> found by nfc_llcp_sock_from_sn() does not disappear.
> Fixes: 8f50020ed9b8 ("NFC: LLCP late binding")
> Reported-by: Sili Luo <>
> Signed-off-by: Eric Dumazet <>
> Cc: Krzysztof Kozlowski <>
> Cc: Willy Tarreau <>
> ---

Reviewed-by: Krzysztof Kozlowski <>

Best regards,

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