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 C163119D066; Thu, 25 Jul 2024 14:41:44 +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=1721918504; cv=none; b=LeuqlBoTcVzHYv37RSYoW6p9wSYufSHR6KMNTC59fSjHbp3yc+Kpm9vxTsCWYV/+iSvo31bVG7V84gPX+3V00zCc1BF5OPO4xpqHcbC+uvOBUMVb+NC50zB2fEB07QRfmTvymln6CeOqoTTNRGySZdXOlW2VPwineGzFHzhYxoA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721918504; c=relaxed/simple; bh=T1z4vm5oxhs8BwmgrfPR15IaEJsSvEbGwYSCko/zaio=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pJVPr4kjyko0rtDg/wqVacP39jxFrMkTGQganROGK2ar92ftxyu7569mwxhfB52XDRrQus9hKPTbGXxwr+YfpUOlbxuYwjlZWNI7Re3KfPKJKnvUEaosMOah4rEA78AUWqL1LOV0Z2xUJME8us50RzenAF7FprCwnohFTH3EOIw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=a9+zBL5A; 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="a9+zBL5A" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38350C116B1; Thu, 25 Jul 2024 14:41:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721918504; bh=T1z4vm5oxhs8BwmgrfPR15IaEJsSvEbGwYSCko/zaio=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a9+zBL5AtHguGSBXvrNoUW/jRvNe+6z5r/rvxQgCotCmxCuQWtB9wHtB2sXzqYahD HJJhqUIn4GBvzPoRlWplP/gRvdo3S1Vx77M58IdxgovvuRPBZXwmMgNy+4f2v66OKP 0v0LS+oZS6E2C9m21hPnLYbZeKAPXioR5Su4ygkI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Paolo Abeni , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.19 08/33] ila: block BH in ila_output() Date: Thu, 25 Jul 2024 16:36:31 +0200 Message-ID: <20240725142728.835743130@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240725142728.511303502@linuxfoundation.org> References: <20240725142728.511303502@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit cf28ff8e4c02e1ffa850755288ac954b6ff0db8c ] As explained in commit 1378817486d6 ("tipc: block BH before using dst_cache"), net/core/dst_cache.c helpers need to be called with BH disabled. ila_output() is called from lwtunnel_output() possibly from process context, and under rcu_read_lock(). We might be interrupted by a softirq, re-enter ila_output() and corrupt dst_cache data structures. Fix the race by using local_bh_disable(). Signed-off-by: Eric Dumazet Acked-by: Paolo Abeni Link: https://lore.kernel.org/r/20240531132636.2637995-5-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/ila/ila_lwt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c index 3d56a2fb6f86f..c7630776bd8e8 100644 --- a/net/ipv6/ila/ila_lwt.c +++ b/net/ipv6/ila/ila_lwt.c @@ -58,7 +58,9 @@ static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb) return orig_dst->lwtstate->orig_output(net, sk, skb); } + local_bh_disable(); dst = dst_cache_get(&ilwt->dst_cache); + local_bh_enable(); if (unlikely(!dst)) { struct ipv6hdr *ip6h = ipv6_hdr(skb); struct flowi6 fl6; @@ -86,8 +88,11 @@ static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb) goto drop; } - if (ilwt->connected) + if (ilwt->connected) { + local_bh_disable(); dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr); + local_bh_enable(); + } } skb_dst_set(skb, dst); -- 2.43.0