From patchwork Mon Oct 14 15:38:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ignat Korchagin X-Patchwork-Id: 13835281 Received: from mail-wr1-f48.google.com (mail-wr1-f48.google.com [209.85.221.48]) (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 ACFC91C7B6F for ; Mon, 14 Oct 2024 15:38:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728920317; cv=none; b=TvGGf8TresgSfYZa9nE3bvpFQP9GwoYZkTJSXqMV2wvOBNNJyje/2r64wkkPGpIFkJcimb4lweybeN1Dwr+bGvm3KYPz30VNTN7S5YRO6bKPg7cjrf2Q9Aj7xXQOV6hJFF1oQOJ0VIv75YSxM+ZYyvpXDw2RlQYW9BWYGhJRa4A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728920317; c=relaxed/simple; bh=TykJJMM5IzwfbahmKZJTnRFTzpHvJ80eOgoE0YjZMYM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QK/igDEJE5AUEShOPQKgNCqx9qGdygQxpATIb7U546G0aH8zHGGeoprciVIWvKvffpbOHTaZn7qtw7w/CBNlhEXoFRpr7lQT1nzTCIF38rUKa4Fu02je/SIU2q/qIISjr/eRsif7/+Uv/Nze/ETkUhOhPprNH3RWk6bkkICB2KA= 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=c3QI9aUK; arc=none smtp.client-ip=209.85.221.48 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="c3QI9aUK" Received: by mail-wr1-f48.google.com with SMTP id ffacd0b85a97d-37d5689eea8so1898156f8f.1 for ; Mon, 14 Oct 2024 08:38:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google09082023; t=1728920314; x=1729525114; 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=49ytr3oVzMOQdVnJdbtLDkZg4U2+YqG6lYXkOtuknMY=; b=c3QI9aUKu6Bi2Q+b8cXS2JW0XWkQrdIxfWRocPjUJ4ipX/DnkFkgfFSoH96GxQjskv H+s5a4sZHs/D1d604fpqEK01TyCQyKdFJfgkd5WKBzAQ4YFDKPAuRNsEujbfaEd0wOhk U2hsj7sc/AdfjvUi3lHThlaDFMkKysLdxdMTn4G92x94laSnlToVfQ6jeu7c7CEluJLR X7FY8MsnnN/Lg7qWc2A6dzJdJOp1vw6kW+mXrHEJdVrmmt/tKVS+YhzaH1YxoMHJrjNA ENQozVzUkLa+X1wb/Djdwd/P4v7UX4Lz8Znxc0zcjnVBrmGvRw90fT6hrOYEPY+RxGlk mttA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728920314; x=1729525114; 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=49ytr3oVzMOQdVnJdbtLDkZg4U2+YqG6lYXkOtuknMY=; b=R3yPBgRky4kGxjPlJ+t34OmQZO+ESGHpuuSY9JNsx0YdQjlNyEnT42qES5VWRWXFdu T1Go1yqfU6KMFcsd5LYCqOJG6YWc8kX4bFLTi3nOCAdBrk3oMsElNXHSPLQrowYYfwpe hnFYvWdkTdQI7Gc7+VvnOp4J0QBCIq35id/juqiecEb8R1cm6QakOLVCoYXfyX8tYow+ ZUc+AkxQiJPKDckWiPqVrcepK7v5TJDPLfdHQgo7bdCxjppRWPHnxUKP+YRZ0epdb2Jz vSgduqPvspUtK1RAHx3yPi/r9WxCTfYy7dXC6lEYvbbADxYZOAPIKT0eazeiJf0SyjPs +QnA== X-Forwarded-Encrypted: i=1; AJvYcCUyaHvYy9zO8WRZ5nnTPSkDGR6WOM4XQSUVmNwbWvxupYp4izN+a4xXhu2GyDKDKPBC2a0frg2zZK9SIUnoZao=@vger.kernel.org X-Gm-Message-State: AOJu0YzzrWM/8jeZoWIJazBaS3ZI2mq/hLT3RHcRnBw40WcdKDzN53gl IXCmZbR/Vqr5t+GZZqmu8E/4Tf3N/9czESlJp3jcm6MYFPe01YgbxXPim1EpJU4= X-Google-Smtp-Source: AGHT+IEK1fXfdN4ULr/3sLohnKiPnjVrQV68cRQbTA59WSVC//oUJKPx9zNQVb7mUdYnIwSncrGyLA== X-Received: by 2002:a5d:688f:0:b0:37d:50e1:b3e1 with SMTP id ffacd0b85a97d-37d551b79c7mr8936288f8f.16.1728920313945; Mon, 14 Oct 2024 08:38:33 -0700 (PDT) Received: from localhost.localdomain ([2a09:bac5:50cb:432::6b:93]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d4b6a8940sm11725913f8f.6.2024.10.14.08.38.32 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 14 Oct 2024 08:38:33 -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 net-next v3 6/9] net: inet: do not leave a dangling sk pointer in inet_create() Date: Mon, 14 Oct 2024 16:38:05 +0100 Message-Id: <20241014153808.51894-7-ignat@cloudflare.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20241014153808.51894-1-ignat@cloudflare.com> References: <20241014153808.51894-1-ignat@cloudflare.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 sock_init_data() attaches the allocated sk object to the provided sock object. If inet_create() fails later, the sk object is freed, but the sock object retains the dangling pointer, which may create use-after-free later. Clear the sk pointer in the sock object on error. Signed-off-by: Ignat Korchagin Reviewed-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet --- net/ipv4/af_inet.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index b24d74616637..8095e82de808 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -376,32 +376,30 @@ static int inet_create(struct net *net, struct socket *sock, int protocol, inet->inet_sport = htons(inet->inet_num); /* Add to protocol hash chains. */ err = sk->sk_prot->hash(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } if (sk->sk_prot->init) { err = sk->sk_prot->init(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } if (!kern) { err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } out: return err; out_rcu_unlock: rcu_read_unlock(); goto out; +out_sk_release: + sk_common_release(sk); + sock->sk = NULL; + goto out; }