From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 548192F7EF8; Sat, 16 May 2026 21:30:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778967007; cv=none; b=aHo4DkoKQWdKZYxF7wNK+8Qd8Q7qLWFQBZxCgxyL4uoz7W5AYAo4HY0v2yDH0p6+BQMTZRPJQGa/lcHHpX2N4Hk+9vXOynQ6s7sSTikKb01bMHyZX+tTKMwwb/Ouw+884XzRa9JmnxUx4KtEA36Ny0a+d3mleJx9AteDa4whx9o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778967007; c=relaxed/simple; bh=/nN2zST9toENEy25LiNPDdtTv54/n7y/8h1fvQB5cvE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=nNQfXmJrK/ehiT39g+KGXAa3ru0uvs5Ex+YJX0utc9+NMMTXtfg7WRi4XMdjZ8M32ig8rNJR6lhKrNvCReix2EYk/0fEio+clBb0qTgUTFmBJBOcHYL7/Z+emrIEv/Q+zEhl+hQ1NMk41F/99xcFAfnJpiLjWvGGnFGyxzd9IT8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SqC6Eq1k; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="SqC6Eq1k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22B11C19425; Sat, 16 May 2026 21:30:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778967007; bh=/nN2zST9toENEy25LiNPDdtTv54/n7y/8h1fvQB5cvE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=SqC6Eq1kPctumGuVgZ5tFRAbmJ7DoMSPUFz40HZptDpMarUcRKjReZ5Cl91abEi/+ CcR7oNRK0bv4wrmsK1zGwGp4M0Q8bgcvuCNDFUmtM7dql72287IvnAmvzhNxBOayKu c91Cdm0J2tpOFC6RIi1AhXv2eIiTwT7+Rkt+R99uRBqpzScYPhFOjsaIO7+XoggFJo DtI6EhmPtOKCbrrfR3K+RZVOvJW+NFxYhEhRTZCH+nzyfDtltf0Vl3tkTgriQwfDgc id/NgtVm/hqie3S1mHXTtTq09gXWFw1atMC7lAcjeh0PpNhkjrfronICkGvAshQ5dF pir30BdmUo+jA== Message-ID: Date: Sat, 16 May 2026 23:30:03 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] net/llc: fix UBSAN array-index-out-of-bounds in llc_conn_state_process To: Kartik Nair , davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+628f93722c08dc5aabe0@syzkaller.appspotmail.com References: <20260515174904.28575-1-contact.kartikn@gmail.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 15/05/2026 19:49, Kartik Nair wrote: > When a timer fires while the socket is owned by a user, the timer event > is deferred to the backlog via __sk_add_backlog(). By the time the > backlog drains, llc->state may have been set to LLC_CONN_OUT_OF_SVC (0) > by socket teardown. llc_conn_state_process() then calls llc_conn_service() > which computes llc_offset_table[state - 1] = llc_offset_table[-1], > triggering UBSAN array-index-out-of-bounds. > > llc_process_tmr_ev() already guards against LLC_CONN_OUT_OF_SVC for the > direct path, but this guard is bypassed when sock_owned_by_user() is true > and the event is queued to the backlog. By the time the backlog drains, > teardown may have set state to 0. > > The direct path already handles this case, so the same check belongs > in the consumer too. Considering you sent similarly complex patches to MM, WiFi, accel and now to NFC, I am sure you are using LLM without disclosing it. Please explain with your own words what is the "direct path"? Best regards, Krzysztof