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 9550D24CD45; Sun, 24 Nov 2024 13:57:21 +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=1732456641; cv=none; b=YTL83a3n3jbFfovUrEJHR64sr5aNxK4m6RnFdjPvzGtANbJ53aP0CeF5WsUdlYaXS18RF1LJIasxRSTmUxTOO6pk+4eb35ZRuQTfYemTgmJ5Agswgjz5JvazWJ1mdrLvcQZl9G1rSY8afDwNrFT5i2xq5sVH8Wws0lcU4jaHA1o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732456641; c=relaxed/simple; bh=6UmNZQznBP0m16qkAj863v5OCr3E8dA6Al0Ybc8uqDk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pvkmtZ0+JyoCCSaK0uKu8uEkJE9sBzKttG1JT1TSnM0PW+106WUxaxJHdvMZEf4kStnLx9UEsxMcAearBdrbsCYPkzhwONlsaBRaYi96uvASvuqINlwDML9t26EBvoah/eKriAdEGlsyv/qsxHTKlLxjzM9Te1mJBL+96Nf/U/A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E7hJx88U; 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="E7hJx88U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7694C4CED1; Sun, 24 Nov 2024 13:57:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732456641; bh=6UmNZQznBP0m16qkAj863v5OCr3E8dA6Al0Ybc8uqDk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E7hJx88UwYf8Gzy1ATvdH+pgKkncyXVT2igNK3LTCgarhb3uW0JloIdKvzTVvi917 hEHrRONXXyzwPrvNbYDuFIffgqppZfq/FOC8YKdOTX63uJ3R+/42uDb7Bush6J81aS 2FU1lZTOLK6JLqxK8zwlBJ+BJCC5BfASNL5cTIWAx+Q/KVhrXoKD0l2UAs/cDWC4d5 m1bDGE6bge5n8kKrAstQe7uEApJOegChRi9DOyMDfVa4SWdkV5WrB3m8SqIHjzYfRA 0N+sSHZ8VXbSCpLnEmXftTQwlq4h2ZZIq1g+X68rQQ41sQv7SWdEeXpF2gCU9WPOUx NgxDB7sUKFp0g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ignat Korchagin , Eric Dumazet , Kuniyuki Iwashima , Willem de Bruijn , Jakub Kicinski , Sasha Levin , willemdebruijn.kernel@gmail.com, davem@davemloft.net, pabeni@redhat.com, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 05/21] af_packet: avoid erroring out after sock_init_data() in packet_create() Date: Sun, 24 Nov 2024 08:56:38 -0500 Message-ID: <20241124135709.3351371-5-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241124135709.3351371-1-sashal@kernel.org> References: <20241124135709.3351371-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 4.19.324 Content-Transfer-Encoding: 8bit From: Ignat Korchagin [ Upstream commit 46f2a11cb82b657fd15bab1c47821b635e03838b ] After sock_init_data() the allocated sk object is attached to the provided sock object. On error, packet_create() frees the sk object leaving the dangling pointer in the sock object on return. Some other code may try to use this pointer and cause use-after-free. Suggested-by: Eric Dumazet Signed-off-by: Ignat Korchagin Reviewed-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20241014153808.51894-2-ignat@cloudflare.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/packet/af_packet.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index b285a6e1a7669..31b2a843611be 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3346,18 +3346,18 @@ static int packet_create(struct net *net, struct socket *sock, int protocol, if (sock->type == SOCK_PACKET) sock->ops = &packet_ops_spkt; + po = pkt_sk(sk); + err = packet_alloc_pending(po); + if (err) + goto out_sk_free; + sock_init_data(sock, sk); - po = pkt_sk(sk); init_completion(&po->skb_completion); sk->sk_family = PF_PACKET; po->num = proto; po->xmit = dev_queue_xmit; - err = packet_alloc_pending(po); - if (err) - goto out2; - packet_cached_dev_reset(po); sk->sk_destruct = packet_sock_destruct; @@ -3392,7 +3392,7 @@ static int packet_create(struct net *net, struct socket *sock, int protocol, preempt_enable(); return 0; -out2: +out_sk_free: sk_free(sk); out: return err; -- 2.43.0