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([2a0d:3344:2712:7e10:4d59:d956:544f:d65c]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7e69e15f5e0sm1449283685a.69.2025.08.12.09.24.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Aug 2025 09:24:02 -0700 (PDT) Message-ID: <50a1e8ea-986c-41f2-899c-746098b6b1b7@redhat.com> Date: Tue, 12 Aug 2025 18:23:59 +0200 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v2 1/2] tls: handle data disappearing from under the TLS ULP To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, andrew+netdev@lunn.ch, horms@kernel.org, borisp@nvidia.com, john.fastabend@gmail.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, sd@queasysnail.net, will@willsroot.io, savy@syst3mfailure.io References: <20250807232907.600366-1-kuba@kernel.org> <20250812062825.391c030c@kernel.org> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20250812062825.391c030c@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/12/25 3:28 PM, Jakub Kicinski wrote: > On Tue, 12 Aug 2025 12:45:56 +0200 Paolo Abeni wrote: >> On 8/8/25 1:29 AM, Jakub Kicinski wrote: >>> diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c >>> index 549d1ea01a72..51c98a007dda 100644 >>> --- a/net/tls/tls_sw.c >>> +++ b/net/tls/tls_sw.c >>> @@ -1384,7 +1384,8 @@ tls_rx_rec_wait(struct sock *sk, struct sk_psock *psock, bool nonblock, >>> return sock_intr_errno(timeo); >>> } >>> >>> - tls_strp_msg_load(&ctx->strp, released); >>> + if (unlikely(!tls_strp_msg_load(&ctx->strp, released))) >>> + return tls_rx_rec_wait(sk, psock, nonblock, false); >> >> I'm probably missing something relevant, but I don't see anything >> preventing the above recursion from going very deep and cause stack >> overflow. >> >> Perhaps something alike: >> >> released = false; >> goto >> >> would be safer? > > It's a tail call to the same function, the compiler should do that for > us automatically. Can we not trust the compiler to be sensible? Both > clang and gcc get it right. Sound reasonable, I dumbly did not consider it. I'm fine with the patch in the current form. /P