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[68.48.65.54]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8e7d69ad48asm1033231385a.19.2026.04.21.06.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 06:56:49 -0700 (PDT) From: Michael Bommarito To: Marcel Holtmann , Luiz Augusto von Dentz Cc: Mat Martineau , Hyunwoo Kim , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v2 2/2] Bluetooth: L2CAP: skip ERTM re-init on repeated CONFIG_RSP Date: Tue, 21 Apr 2026 09:56:39 -0400 Message-ID: <20260421135639.3185653-3-michael.bommarito@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: <20260417221628.1674866-1-michael.bommarito@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit commit 25f420a0d4cf ("Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop") taught l2cap_config_req() not to call l2cap_ertm_init() again once the channel is already in BT_CONNECTED. l2cap_config_rsp() still lacks the same guard. After the initial ERTM setup, any extra successful CONFIG_RSP re-enters l2cap_ertm_init(), reinitializes tx_q and srej_q, and allocates fresh sequence lists over the existing channel state. Mirror the existing BT_CONNECTED check in l2cap_config_rsp() so response parsing can still update negotiated parameters without reinitializing ERTM state or leaking the old resources. Cc: stable@vger.kernel.org Signed-off-by: Michael Bommarito Assisted-by: Claude:claude-opus-4-7 --- Changes in v2: - split out of the original zero-txwin patch so the repeated `CONFIG_RSP` ERTM re-init bug is reviewed as a distinct issue - mirror the existing `BT_CONNECTED` guard already present on the `CONFIG_REQ` side after commit 25f420a0d4cf net/bluetooth/l2cap_core.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 7ffafd117817..fe98f4821a90 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -4480,14 +4480,16 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) { set_default_fcs(chan); - if (chan->mode == L2CAP_MODE_ERTM || - chan->mode == L2CAP_MODE_STREAMING) - err = l2cap_ertm_init(chan); + if (chan->state != BT_CONNECTED) { + if (chan->mode == L2CAP_MODE_ERTM || + chan->mode == L2CAP_MODE_STREAMING) + err = l2cap_ertm_init(chan); - if (err < 0) - l2cap_send_disconn_req(chan, -err); - else - l2cap_chan_ready(chan); + if (err < 0) + l2cap_send_disconn_req(chan, -err); + else + l2cap_chan_ready(chan); + } } done: -- 2.53.0