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 AD16C12EBEA; Tue, 25 Jun 2024 09:40:59 +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=1719308459; cv=none; b=PUQNOkqdvA/6IJhv2Kl2LoR/L3Gr08b75cEHpEZgkCAnQ1d5S7zrexXzqFaPWcBfN9u2RsAGFDVShmMSS2O9RZHJ+JvFqcg2vDpypgP1w83KFLs9YXd+dH0GEDedCICdfsIwuEFQhFDOGsXIaClBFLsNqe3wLes/5M4wHwpjyQU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719308459; c=relaxed/simple; bh=o/in4nCmG6Dq11VBsmc4CSZ09YsETf2goB3VoeDv0go=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fINhncc5f29tF+hsES7f4TsmR8jWsX0F+LR1BMUaIxWs6a/2duxMRvD1zxjUeYPiuJU0putU/nnl9iXIPhfaj8xppqRR0ZPRwYkQK75BiFfHDjEBqIbJvApr+EwmHyhrgxepWG3yPIwauMonrXGfwGQsN7h7mwU25PpGpO+4YCM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ePmwwYhD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ePmwwYhD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 291F4C32781; Tue, 25 Jun 2024 09:40:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1719308459; bh=o/in4nCmG6Dq11VBsmc4CSZ09YsETf2goB3VoeDv0go=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ePmwwYhDp1rn2bXCYsBwIhf/4CLhRH4vD8M53CPAe8D1ws6r0kziyBJAsGTBWNTvD 5pk54vf+kBaRWsB/jrVChFyPRw7K/iqsGVyb5BCstRo5ltlbMBMXdkhTVAh/vhA6Ki n7guu2j9BpfxQ75yT4YpCX0TjeBV0fIRW3T1Bgc8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shuang Li , Xin Long , Paolo Abeni , Sasha Levin Subject: [PATCH 6.9 127/250] tipc: force a dst refcount before doing decryption Date: Tue, 25 Jun 2024 11:31:25 +0200 Message-ID: <20240625085552.941131149@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240625085548.033507125@linuxfoundation.org> References: <20240625085548.033507125@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long [ Upstream commit 2ebe8f840c7450ecbfca9d18ac92e9ce9155e269 ] As it says in commit 3bc07321ccc2 ("xfrm: Force a dst refcount before entering the xfrm type handlers"): "Crypto requests might return asynchronous. In this case we leave the rcu protected region, so force a refcount on the skb's destination entry before we enter the xfrm type input/output handlers." On TIPC decryption path it has the same problem, and skb_dst_force() should be called before doing decryption to avoid a possible crash. Shuang reported this issue when this warning is triggered: [] WARNING: include/net/dst.h:337 tipc_sk_rcv+0x1055/0x1ea0 [tipc] [] Kdump: loaded Tainted: G W --------- - - 4.18.0-496.el8.x86_64+debug [] Workqueue: crypto cryptd_queue_worker [] RIP: 0010:tipc_sk_rcv+0x1055/0x1ea0 [tipc] [] Call Trace: [] tipc_sk_mcast_rcv+0x548/0xea0 [tipc] [] tipc_rcv+0xcf5/0x1060 [tipc] [] tipc_aead_decrypt_done+0x215/0x2e0 [tipc] [] cryptd_aead_crypt+0xdb/0x190 [] cryptd_queue_worker+0xed/0x190 [] process_one_work+0x93d/0x17e0 Fixes: fc1b6d6de220 ("tipc: introduce TIPC encryption & authentication") Reported-by: Shuang Li Signed-off-by: Xin Long Link: https://lore.kernel.org/r/fbe3195fad6997a4eec62d9bf076b2ad03ac336b.1718476040.git.lucien.xin@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/tipc/node.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/tipc/node.c b/net/tipc/node.c index c1e890a824347..500320e5ca479 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -2105,6 +2105,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b) } else { n = tipc_node_find_by_id(net, ehdr->id); } + skb_dst_force(skb); tipc_crypto_rcv(net, (n) ? n->crypto_rx : NULL, &skb, b); if (!skb) return; -- 2.43.0