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 3348F63D2E; Tue, 16 Jan 2024 20:00:05 +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=1705435206; cv=none; b=ttOluk3B25KnzZDaONSf3l4kAbS2GSsmWUdvO1MUvHjmEWD60rLo9kXC5TdVaznH2shMyYzaXtQzTVDfx0oGwXNqaugta26SxqxZAQliKagOJTRYOPseSgFGBJMYHHC1wa0r1WIq+z/+CB+jpJ2QsS/cc96LraDgLBiZv9p7OWo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705435206; c=relaxed/simple; bh=Q6t0rEUijPTx1Th9dajt8tEX4Z69jc5LtHqBY7UsTjs=; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version:Content-Type:X-stable: X-Patchwork-Hint:X-stable-base:Content-Transfer-Encoding; b=u3S9RJDE6JUiDBNYAjIckvxwcO6WQxfKdTMMmrfxJMUiCnB5EUaACFyV33ble0ubhzQOEgjSuCj2C8epQpdxf3ynTdXUnsYRH2/gHxvdg4bYFiCygVkyrXHxnu6AHS9OWHXCZTv3qF6T++1mD85JuSD8mYl1xpM6OlKPv0OH+R4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SxHmjMKF; 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="SxHmjMKF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6B4CC43399; Tue, 16 Jan 2024 20:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705435205; bh=Q6t0rEUijPTx1Th9dajt8tEX4Z69jc5LtHqBY7UsTjs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SxHmjMKFVOYYaX1n4HCdl3N73hXJRTTL1W9bb3+72ti6R5GiFZan0LLYjqzJwX0/P jqKJuWdP2YXqvg9rbh5h97e0PbX3K11uSHr8TalJCpEz5+Kpihw8bE78PPy328qAGR d7kcM9oxOAgXZfBRzV84vkcmtd7E57rF48dvO6qW7vl9Fe0eqPUEReV9vRtjArYbjy zqUqWQfcG8HaDatUy/kY02fx3LR8SOiZyXy7fnu66C2vnBpDA+yN2gg9/elZLBduUX be/UqX5HBD/vWYt2TSkDB3ICxjjBB+H1oz4vpk6dndye8zK9om8EmWD61JU9nXB+6m 6z2OZJGOZx+JA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Danis?= , Luiz Augusto von Dentz , Sasha Levin , marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com, linux-bluetooth@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 44/47] Bluetooth: L2CAP: Fix possible multiple reject send Date: Tue, 16 Jan 2024 14:57:47 -0500 Message-ID: <20240116195834.257313-44-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240116195834.257313-1-sashal@kernel.org> References: <20240116195834.257313-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.147 Content-Transfer-Encoding: 8bit From: Frédéric Danis [ Upstream commit 96a3398b467ab8aada3df2f3a79f4b7835d068b8 ] In case of an incomplete command or a command with a null identifier 2 reject packets will be sent, one with the identifier and one with 0. Consuming the data of the command will prevent it. This allows to send a reject packet for each corrupted command in a multi-command packet. Signed-off-by: Frédéric Danis Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/l2cap_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 9f3596de90a7..850b6aab7377 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6527,7 +6527,8 @@ static inline void l2cap_sig_channel(struct l2cap_conn *conn, if (len > skb->len || !cmd->ident) { BT_DBG("corrupted command"); l2cap_sig_send_rej(conn, cmd->ident); - break; + skb_pull(skb, len > skb->len ? skb->len : len); + continue; } err = l2cap_bredr_sig_cmd(conn, cmd, len, skb->data); -- 2.43.0