From nobody Sat Jul 25 21:20:58 2026 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 136C637756A for ; Mon, 13 Jul 2026 12:50:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783947017; cv=none; b=BpxINXhZXL/rNR5G/AlZDgcCjUZBea1tywB1nB1ZO3YAqLw0FmwdoJKLTG7ipzGhultsWwpIW9kzP2clY5k4yPq+tZARmcs6I4RUqLWyqAVjrg4MeLhJ1HNkwmNXl5ZsVaRv+bej09e/DEM0LIcCI9pqhVTC0bALjCdjlaqSLzE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783947017; c=relaxed/simple; bh=S92pQ2C0qUV/KBqi32UApWFOvWJs4dXNLhZODPKvz9M=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uINpGsK2wZRQE9qItfDSofUS8EbsApvh8LQLu1OVIDH8oiKx0IZ3joU+IA58loGbTI4mcH8z8L5GBPXgtJ6F0L/RjS1hJvQXrALFpvu7kTnfM9bDVMw4U2Ng3Ti8+QSzIcGpKVIBdhCAw2zjXhQ6m6BunkyduJR5vxtVGYDi4QU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=S3LyF4yF; arc=none smtp.client-ip=209.85.214.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="S3LyF4yF" Received: by mail-pl1-f174.google.com with SMTP id d9443c01a7336-2ceae1ed204so15754495ad.0 for ; Mon, 13 Jul 2026 05:50:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1783947015; x=1784551815; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=TvooeHfwR2QntnuwEEpfCHr1XrT9fgk2dlfW1+7scHw=; b=S3LyF4yFCL8Rb/DLclSRrX8LAud28j1tN9zG8au2ig8qIULMOML73cVJ+9ZeQqazhQ sqV28oVOALOyyGqBIaVS3Q7TNcO9yKtf4iOcEqhzJVBPcGt6/j1XR93sYo2zCHeBjJqx jLrjp+PC9M9AEc3OMM24Xt3dBdgziXgOXIG3OIfaXbMVScJoJnIm0ntvklxUJs/skj4t kxt+Gb2DpLnVyrh9tgkJCWhSGTWFfzpXKzQJcQp7faDf6GiSioQ+JdxbQeMMR+igbq7R 3YkyZmq0vi5ml9owV+R4O6pIX77dcEmyv23/EKjoDMj73pwCR7pJ2/+py2VzmeN35HDs NXNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783947015; x=1784551815; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=TvooeHfwR2QntnuwEEpfCHr1XrT9fgk2dlfW1+7scHw=; b=L62FYhIVaswd7X0+yL4vGyeR5y4TplizPKw/m1zFp/URVjOTm4ltt+HLtiM0Trlxlw 3vUml9MfA5lS82VofVEfzldVNCgvgfGnmDVpRrqf8u5a+8kNB2SAzP1NXtvpU1c192cv 9k2CgZZL3C1QhmnyoB88tkuDXNz9GDS4EdYqia54qrNbjRbMwoRIcyYAkLKh5Ol8dYo3 GR+gL5QfRD+ago/HlESD+F3wCRYDWufn1w91EEH/R2y7HBtL9RZ9RpeFxTjRZAX/dymc rF14AoKldm5frZ2IM1tBfSXs+rhGzCC2nUhVRKVpFWP/6IefJ9JACrMZ0IjF5pZUKSKF nInA== X-Forwarded-Encrypted: i=1; AHgh+RpTidIVKWObs6ev7wRQ6d72UJziNbcE4MumfOqcXtBFyPANeambQo9jhBNNyjpdItJvzAo2nRSCeC+rzSs=@vger.kernel.org X-Gm-Message-State: AOJu0YzFjn77iXzpUqXrzFgVoNLcwEAy6lluuBSDuludFRfyxy2NECR9 yPDCBUXp9uSVXWJNtB/0VKDvhPTnu0mLn0zotnRzPKh076iWgRo1kOq0 X-Gm-Gg: AfdE7clqCeYQRTyD6/MWXcvQPHiM1zzT44L201UhTVkJhlsVf6gm2L7yOM0dpJTqMvC tID98r3D5ck2ctYhNckbDO1wg6GSTyeZy6uSWIi3x0U4R1ny9OlORcYl7kXQWEI8vHTQTjSlouJ 1vsuZJ77RYVH+DcakmEX+/IY7NSkcyOWVzaeXNPJD24+AbdECtS9Ca2TSGXx3ttfSUY9beaWD73 qE4rpVMmV65qpYuw4489LNS1zSKTIMvwV4ziB/pHjbWGNLdC15e0jBx6q0ltB6M365q72JbfqwO eJcQmXxjKQLvCL/N+0KYiXNmyQoDAZzJcL5Havx1KdfToZJKjNbqTYWO14aEZevL0Klu0sKxf+7 pNBpZMsDbtq4kOocKdm/DNaKDeeUfetLmZQfzTBsHQ0ZjNNEB/vYZWhEOd8HGhJrIwMauFVHISu 2zewwZTWsaL2jJVJCSaroXQ6Iuh9AsiJoVjOLPDcc6fThFWRGImP28zte+AxvFr9Tmbw+2rZXyb 560sKDbUnrutYi5isbzysq/iRFkTwaang== X-Received: by 2002:a17:903:3904:b0:2c9:c517:d078 with SMTP id d9443c01a7336-2ce9f038f6amr81245505ad.36.1783947014974; Mon, 13 Jul 2026 05:50:14 -0700 (PDT) Received: from localhost.localdomain ([101.251.7.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ccc9bdb76asm101815485ad.12.2026.07.13.05.50.12 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 13 Jul 2026 05:50:14 -0700 (PDT) From: Laxman Acharya Padhya To: Marcel Holtmann , Luiz Augusto von Dentz Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] Bluetooth: btbcm: bound local name logging Date: Mon, 13 Jul 2026 18:35:08 +0545 Message-ID: <20260713125008.75358-1-acharyalaxman8848@gmail.com> X-Mailer: git-send-email 2.51.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The HCI Read Local Name response contains a fixed 248-byte name. A NUL terminator is supplied only when the name is shorter than the maximum length. btbcm prints the returned name using %s, so a maximum-length controller name lets the log formatting read past the HCI response buffer. Use a precision of HCI_MAX_NAME_LENGTH when logging the name. Fixes: 9bc63ca0904d ("Bluetooth: btbcm: Read the local name in setup stage") Fixes: 2fcdd562b91b ("Bluetooth: btbcm: Make btbcm_initialize() print local= -name on re-init too") Cc: stable@vger.kernel.org Signed-off-by: Laxman Acharya Padhya --- drivers/bluetooth/btbcm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c index 463d59890bef..499e12169ca3 100644 --- a/drivers/bluetooth/btbcm.c +++ b/drivers/bluetooth/btbcm.c @@ -479,7 +479,8 @@ static int btbcm_print_local_name(struct hci_dev *hdev) if (IS_ERR(skb)) return PTR_ERR(skb); =20 - bt_dev_info(hdev, "%s", (char *)(skb->data + 1)); + bt_dev_info(hdev, "%.*s", HCI_MAX_NAME_LENGTH, + (char *)(skb->data + 1)); kfree_skb(skb); =20 return 0; @@ -766,7 +767,8 @@ int btbcm_setup_apple(struct hci_dev *hdev) /* Read Local Name */ skb =3D btbcm_read_local_name(hdev); if (!IS_ERR(skb)) { - bt_dev_info(hdev, "%s", (char *)(skb->data + 1)); + bt_dev_info(hdev, "%.*s", HCI_MAX_NAME_LENGTH, + (char *)(skb->data + 1)); kfree_skb(skb); } =20 --=20 2.51.2