From patchwork Mon Oct 7 21:34:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ignat Korchagin X-Patchwork-Id: 13825284 Received: from mail-wr1-f42.google.com (mail-wr1-f42.google.com [209.85.221.42]) (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 48C98197521 for ; Mon, 7 Oct 2024 21:35:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728336951; cv=none; b=s6t50QA84gMX53ZyT985GlIn6e0ZiPxkFuIfmeVRbEq/f2yP6Z7iWwRAH50oPS1AbceDY2wnIgaLUtwr6IfYWxPUu2TRt1qe7j2J7/t02tiYYqmCsbA9tL8J9ohxHgB0oEXNFhpExm8Ucu7jafHIS4Dd2EUzJ/d7JrEh8f+GI5c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728336951; c=relaxed/simple; bh=+sATRWeawQEUv1+UCi+L6joXgd2sN0KH+RYIISQm3Ag=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=OIhmsNFwsGactMMMGyS0qGJDJR1icHSOrGiT7RWO9s7z1WS3ZSy6m+63z5lqDEbem+xWrfV5L2pBNOg91ygs8IS6PwoUyehSBeVARtH1yyXbYuylsdHKqPVjjTZSdFMw3T3OglpdZrKQi3s4nb3ILi5ZHF3ZFefn0X8aWNGZ9Ac= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cloudflare.com; spf=pass smtp.mailfrom=cloudflare.com; dkim=pass (2048-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b=IHTWAhgP; arc=none smtp.client-ip=209.85.221.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cloudflare.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cloudflare.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="IHTWAhgP" Received: by mail-wr1-f42.google.com with SMTP id ffacd0b85a97d-37ccc597b96so3101334f8f.3 for ; Mon, 07 Oct 2024 14:35:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google09082023; t=1728336949; x=1728941749; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=47ahDvpGlziX1HY/1UDQ79MexuwMxPJ3vAc1BGnN1yo=; b=IHTWAhgPb3HdgloVHYocEY2AnKcpdxZogqrXgleub6TgSbKyJAAgB+4ugho6ciTijd Bg2GTLD5tKp5WM8IJJ6yiq8H7Vbd0N06vfB0HdAqKkXy663vopMy2Wg+IqznijbqehYf G2Ihpk7LibE1LGk7QwwbJdw5bRMf0Ue+CpIESxwyhynPDtd8oXt3qOYfZP2NhNujfPhi ogBmcRZwtUR29UGJJZIC11k5v4LQasYyv87wX6X3D0sjXBRhkNZ4nFsJBHajGlx3ZzWz rH6EngHBNUbt5+3PMbn2nZrybxoBU4Nk84s6rSlHZxPOf4WO5oJiJO2DTyxVqw4ooGiR xCXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728336949; x=1728941749; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=47ahDvpGlziX1HY/1UDQ79MexuwMxPJ3vAc1BGnN1yo=; b=jJ04Ru1/OVDuZtJkj2HCOX+dFoVeMO9BjId/ZUNi8RIjyC4xoV0reLrHoKS0w9CpyD iEcz4UvmMbZMTM8bGA8P/eT9793mHyiJpBHUAC1RouZQaSEq06J5DcxyNudyPspMAxHN 6aoEHSFqaxuArEXyBJiIXHuJ+1/LU64ht1CbYej6HU/A/yIz+T+nXHkfHQcJVEbUC7Ru 7a9SkxmJxqJU91gQ8XSe0Nz9aDP99zpicZjkwboREC+C9UVN5d7IYltzzrXJLcQP7RPF 8wQ+cdSF/Xv6eCDlmyHM0+LECt5nMHsMPp8r5bsSyxVBppyu+90MnRY94RE1gNdogtLT DDLw== X-Forwarded-Encrypted: i=1; AJvYcCVQd+Cu6DV20leLxiRVA9SD/y2PBeNMLV8OlUeBF8j+bwTwiZNI5au3vNF2yAmDOFrh6tWc/sNUVGeIgZvnqpY=@vger.kernel.org X-Gm-Message-State: AOJu0YxF2l7J4BLp8fnNxJNq/o+fqRiisI9yxvuf/f2oyw3x9AgQngw5 i01k7ggTmwhhke1zPaVgnkDG3kZ3gBcEbmiOwSM2rZbykESyE9Up3Ql39Cl7YhE= X-Google-Smtp-Source: AGHT+IEh2nNtGTy8ZHuRwyExnrSdxDBOaaRu0AmF4uU5YudljkVsFMbPD2jmqiCN6O47wxbJKhk2fQ== X-Received: by 2002:a5d:4d06:0:b0:374:c17a:55b5 with SMTP id ffacd0b85a97d-37d0e6f8eccmr8676059f8f.14.1728336944360; Mon, 07 Oct 2024 14:35:44 -0700 (PDT) Received: from localhost.localdomain ([104.28.192.66]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d1691a4absm6535887f8f.29.2024.10.07.14.35.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 07 Oct 2024 14:35:43 -0700 (PDT) From: Ignat Korchagin To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , Oliver Hartkopp , Marc Kleine-Budde , Alexander Aring , Stefan Schmidt , Miquel Raynal , David Ahern , Willem de Bruijn , linux-bluetooth@vger.kernel.org, linux-can@vger.kernel.org, linux-wpan@vger.kernel.org Cc: kernel-team@cloudflare.com, kuniyu@amazon.com, alibuda@linux.alibaba.com, Ignat Korchagin Subject: [PATCH v2 4/8] Bluetooth: RFCOMM: avoid leaving dangling sk pointer in rfcomm_sock_alloc() Date: Mon, 7 Oct 2024 22:34:58 +0100 Message-Id: <20241007213502.28183-5-ignat@cloudflare.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20241007213502.28183-1-ignat@cloudflare.com> References: <20241007213502.28183-1-ignat@cloudflare.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 bt_sock_alloc() attaches allocated sk object to the provided sock object. If rfcomm_dlc_alloc() fails, we release the sk object, but leave the dangling pointer in the sock object, which may cause use-after-free. Fix this by swapping calls to bt_sock_alloc() and rfcomm_dlc_alloc(). Signed-off-by: Ignat Korchagin --- net/bluetooth/rfcomm/sock.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index 37d63d768afb..0d0c4311da57 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -274,13 +274,13 @@ static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, struct rfcomm_dlc *d; struct sock *sk; - sk = bt_sock_alloc(net, sock, &rfcomm_proto, proto, prio, kern); - if (!sk) + d = rfcomm_dlc_alloc(prio); + if (!d) return NULL; - d = rfcomm_dlc_alloc(prio); - if (!d) { - sk_free(sk); + sk = bt_sock_alloc(net, sock, &rfcomm_proto, proto, prio, kern); + if (!sk) { + rfcomm_dlc_free(d); return NULL; }